Nepeta Trial Report 2018–2021 RHS Registered Charity No: 222879/SC038262
The Award of Garden Merit The Royal Horticultural Society trials a wide range of ornamental and edible garden plants to test their performance. The best may receive a prestigious RHS Award of Garden Merit (AGM). Plant trials provide the opportunity for multiple selections of the same plant to be grown side by side for the purpose of comparison. The AGM is intended to help gardeners select plants that have good all-round garden value, and is only awarded to plants that are: • Excellent for ordinary use in appropriate conditions • Available • Of good constitution • Essentially stable in form and colour • Reasonably resistant to pests and diseases The plants may be grown from seed and/or vegetative material as appropriate, and are submitted by nurseries, individuals and breeders. Visitors to RHS Garden Wisley can view ongoing plant trials in the Trials Garden. Trials can also be seen in the dedicated beds in The Old Frameyard at RHS Garden Bridgewater. Individual trials are sometimes held at the other RHS Gardens as well as other gardens and nurseries across the UK. Plants of all kinds, including fruit and vegetables, may be considered for the AGM. Currently, more than 7,500 plants have an AGM, with new awards made each year. Awards are made following assessment by a forum of experts, including nursery owners, specialist growers and horticulturists, all appointed by the RHS. The trial results are used to inform the forums’ decision to award plants the AGM status. Each assessment is then ratified by the relevant RHS Plant Committee. RHS awards can also be given by Roundtable assessment. An award is given when a forum of horticultural experts meets to debate the characteristics and garden performance of plants that the RHS is unable to trial in one of the RHS Gardens or another location. To ensure consistent standards are maintained, the AGM is subject to regular review to make sure that every plant still merits its place on the list. Since 2013, reviews have been conducted by each RHS Plant Committee on a rolling basis. RHS Horticultural Database and Herbarium RHS Plant Trials provide an important record for RHS research into cultivated plants and their names, and data is stored on the RHS Horticultural Database. Trials are also an important source of material for the Herbarium at Wisley. Its primary focus is to acquire and maintain reference material of plants in cultivation. Buying plants with the AGM It is easy to find and buy AGM plants: • Search using the RHS ‘Find a Plant’ feature on rhs.org.uk/plants, using the AGM Plant Search • Download a list at rhs.org.uk/agmlists • Check the latest edition of the RHS Plant Finder book, available to buy at rhsshop.co.uk • Look out for the AGM logo the next time you are in a garden centre or nursery All images © RHS / Nicola Stockton, unless otherwise indicated
Nepeta Trial 2018–2021 1 Introduction to Nepeta Nepeta, or catmint, a member of the mint family (Lamiaceae), is a clump-forming plant with erect stems and aromatic, grey-green leaves. There are over 200 species of perennials and annuals. Small lavender, mauve-blue to pink-blue or white flowers are borne on multiple racemes among the soft foliage throughout summer. Nepeta govaniana produces delicate lemon-yellow flowers. Most need well-drained soil in full sun. Some prefer moist soil and partial shade. The plants are highly attractive to bees and other insects, so are great for pollinators. Trial location The trial was located on the Portsmouth Trials Field at RHS Garden Wisley. Objectives The objectives of the trial were to assess a range of cultivars and to recommend the Award of Garden Merit to outstanding cultivars for garden use. Judging The Nepeta Trial Assessment Forum viewed the trial regularly in 2018, 2019, and 2021. No assessments took place during 2020 due to the impact of the Covid-19 pandemic. Members of the assessment forum were: L Russell (joint chair), F Garrett (joint chair), V Bourne, S Edney, J Fielding, G Gough, F Rasch, F Reddaway, S Roe and D Smith. The forum assessed the plants using the following judging criteria: • Overall impact • Habit and vigour • Length of flowering period • Quality of flower – colour, shape, proportions • Quality of foliage • Proportion of flower to foliage • Resistance to weather • Susceptibility to pest and disease • Ease of cultivation • Persistence and reliability
2 Nepeta Trial 2018–2021 Entries There were 123 entries in the trial, submitted by various companies and individuals in the UK. Fi Reddaway, Plant Heritage National Collection Holder, Devon, submitted many of the plants. A full list is provided on pages 17–18. Cultivation Most of the trial plants were supplied as rooted cuttings, in 50 cell trays in July 2016. Extra cuttings were also provided by Fergus Garrett of Great Dixter Garden, East Sussex. The young plants were pinched out after rooting and potted on into 1 litre containers and overwintered under cold glass at RHS Garden Wisley. In preparing the trial bed a Caliente mustard (Brassica juncea) crop was grown, rotavated into the soil and covered with plastic in April 2017. This acted as a green manure and bio-fumigante. Trial entries were planted and puddled in during late May 2017. A few Nepeta types prefer moisture and shade rather than full sun, so we tried to accommodate this as much as possible in the planting plan, within the limitations of the site. Some additional entries, sourced in the trade, were planted in autumn 2017. Irrigation was provided every two to three days during dry hot weather, especially important for the nuda, cyanea (syn. kubanica) and subsessilis types which generally need more moisture. Plants were cut back by half to reduce top growth in early June 2017. Plants were mulched with Strulch during late June 2017. In early December 2017 all plants were cut back by one third. In mid-March 2018 all entries were sheared back to new growth. A fertiliser (30g/m2 of sulphate of ammonia, 25g/m2 of sulphate of potash) was applied in April 2018, after which no further fertiliser was used during the duration of the trial. During 2019 pruning regimes were varied: one plant was cut down to the base after flowering, one plant was lightly deadheaded to the base of the flowering stem, the third plant left unpruned. For all nuda types, one plant was cut to the base after flowering, two plants were left unpruned for seed heads. For cyanea (syn. kubanica) types, no summer pruning was carried out as they will not re-flower. Pruning was simplified for 2021: one plant lightly deadheaded to the base of the flowering stem after flowering. All nuda types were left unpruned. Some entries did not seem to have benefited from pruning or cutting back in terms of second flush, the three options having relatively similar characteristics. Racemosas overall performed well in late season when cut back in early to mid-July. We found that due to the rapid rates of regrowth for racemosa and fassenii types it was simpler to prune these by cutting back to the base rather than deadheading. Some Nepeta types, such as nuda and kubanica, can be grown for seedhead interest and should not be cut down early. Spring weather conditions in 2021: There were several frosts in April 2021, which was the coldest in the UK since 1922. At Wisley, we experienced an unprecedented 16 air frosts (monthly average is 3) and 25 ground frosts (monthly average is 11) in the month. The mean minimum temperature was 0.5°C, the kind of temperature that would be more typical of January. Wisley’s long-term mean minimum temperature for April is 4.7°C. The lowest minimum temperature was -3.6°C on the 7th April and the lowest grass temperature was -11.3°C on the same day. The maximum temperatures were also below average, with the monthly average at 12.3°C (longterm average 14.6°C).
Nepeta Trial 2018–2021 3 AGM Nepeta The following are the plants that fulfilled the Award of Garden Merit criteria during the trial. Descriptions have been largely based on RHS Find a Plant, where available (rhs.org.uk/plants). RHS hardiness ratings To help gardeners determine which plants may be hardy in their locality the RHS hardiness rating scheme outlined below has been devised as a general guide to growing conditions. Temperatures given are minimum winter temperatures. Hardiness ratings are as follows: H1a tropical: heated greenhouse (warmer than 15°C) H1b subtropical: heated greenhouse (10°C to 15°C) H1c warm temperate: heated greenhouse (5°C to 10°C) H2 tender: cool or frost-free greenhouse (1°C to 5°C) H3 half hardy: unheated greenhouse or mild winter (-5°C to 1°C) H4 hardy: average winter (-10°C to -5°C) H5 hardy: cold winter (-15°C to -10°C) H6 hardy: very cold winter (-20°C to -15°C) H7 very hardy (colder than -20°C) Rescinded, reconfirmed and retained When an existing AGM plant is included in an RHS Plant Trial or Roundtable, it is assessed and voted on like any other plant, to make sure it still merits its place on the AGM list. If the decision is that it is no longer worthy of the AGM, the award is rescinded and the plant is removed from the AGM list. Rescinded plants may no longer be displayed or sold with the AGM trophy symbol on the label. If the decision is that it is still AGM-worthy the award is reconfirmed. A plant may be reconfirmed multiple times, for instance after separate trials a few years apart. The official award date is still the original date, however. So if the award was made in 2005 and reconfirmed in 2010 and 2014, the award date remains as 2005. On some rare occasions there may be insufficient votes either to rescind or to reconfirm the award. This may happen if the outcome of the trial is inconclusive for example. In such cases, the award is retained. This means its status is exactly the same as before the assessment and is not a reflection on the quality of the plant.
4 Nepeta Trial 2018–2021 Nepeta ‘Blue Dragon’ AGM (H7) 2021 Description: A vigorous upright, fast spreading perennial to about 80cm, with bright green, toothed leaves and large, striking blue-violet flowers in short spikes from mid-summer to early autumn. Forum comments: Floriferous, later flowering. Large, dark flowers of rich mauve-blue. Long corolla and spotted lip. Dark green foliage. Strong vigorous growth. A moderate runner. Very large individual flowers. In dryer conditions can be lax and could need staking. Best on relatively moist soil. Nepeta ‘Chettle Blue’ AGM (H7) 2021 Decsription: A strong bushy perennial, height to about 75cm with greyish green toothed leaves. In summer with long intense striking blue flowers with distinct purple calcyes. Forum comments: Attractive deep mauve-blue flower. Dark calyx. Floriferous. Excellent rich colour tones. Spent flowers do not detract. Slightly lax habit. Flowering spikes held up well on long flower stems. Wide, uniform habit. Healthy foliage. Good flower impact. Large, fresh green leaves. Attractive seed heads.
Nepeta Trial 2018–2021 5 Nepeta cyanea (synonym N. kubanica) AGM (H7) 2021 Description: A strong, clump-forming perennial to about 80cm with large leaves and spikes of large purple-blue flowers with dark purple calyces from midsummer. Forum comments: Strong stems. Even height. Good flower intensity with dark calyx. Large flowers, strong purple-blue, good floral impact. Full, dense habit. Attractive drift. Good strong seed heads. Good presence with impact. Prefers moist soil. Nepeta cyanea dark form (synonym N. kubanica dark form) AGM (H7), subject to naming and availability Description: A perennial to around 90cm tall with toothed, oval leaves and spikes of deep blue flowers with dark purple calyces arranged in dense, whorled clusters in summer and early autumn. Forum comments: Strong, upright habit. Neat, tall plants. Large flowers, strong mauve-blue with heavily spotted lip. Good floral impact. Dark red calyces and dark red stems. Stems hold well. Foliage shows attractive autumn colour. Striking large seed heads, with hint of purplered. Prefers moist soil. Best in light shade.
6 Nepeta Trial 2018–2021 Nepeta × faassenii Junior Walker (‘Novanepjun’) AGM (H7) 2021 Description: A perennial of low, spreading habit to about 45cm tall, with wrinkled silvery greygreen, hairy leaves on low-branching stems and spikes of tubular, lavender-blue flowers from early summer to early autumn. Forum comments: Good branching of flower stems. Small grey-green leaves. Neat mounds 40 × 60cm. Holding good shape. Flower colour a rich mauve with dark calyces. Long flowering season, and good re-flower. Nepeta × faassenii ‘Blue Wonder’ AGM (H7) 2021 Description: A compact perennial to about 30cm tall with wrinkled silvery grey-green, hairy leaves and spikes of large, rich blue tubular flowers from early summer to early autumn. Forum comments: Neat, compact mounds. Flowers held well above foliage, and evenly across the dome. Airy, even habit. Good second flush. Pleasing. Long-flowering. Good mauve-blue. Holding shape. Dark stems contrast well with autumn colour.
Nepeta Trial 2018–2021 7 Nepeta × faassenii ‘Purrsian Blue’ AGM (H7) 2021 Description: A compact, neat, mounded perennial reaching to about 45cm in height but doubling its spread by its second year of growth. Greyish green, toothed leaves. In summer with long striking densely packed blue flowers with dark purple calyces on upright stems. Forum comments: Very neat and uniform. Ideal for containers. Very floriferous. Stems radiate very neatly – pin cushion effect. Good dark stems. Good performer through the season throwing continuous new flowers on original stems. Flowers mauveblue with a contrasting dark calyx. Nepeta × faassenii ‘Kit Cat’ AGM (H7) 2021 Description: A compact, clumpforming perennial with grey-green, hairy leaves. Spikes of purple and pale blue flowers through summer. Height to about 50cm. Forum comments: Low, neat, tidy mounds. Ideal for small gardens, rockery or wall-crevice. Floriferous. Small grey-green leaves attractively sets off the flower. Seed heads not detracting. Flowers rich mauve-blue.
8 Nepeta Trial 2018–2021 Nepeta grandiflora ‘Bramdean’ AGM (H6) 2012, reconfirmed (H7) 2021 Description: An upright perennial to about 75cm tall, of loose, open habit. Striking dark stems with oval, grey-green leaves. Long, lax spikes of deep indigo-blue flowers over a long period in summer. Forum comments: Floriferous. Upright, uniform habit. Distinct dark stems. Clean, fresh, effective foliage. No splitting. Flowers are a rich mauve-blue. Nepeta govaniana AGM (H7) 2021 Description: An upright, strong stemmed, branching perennial with soft hairy leaves and open racemes of pale yellow flowers, 3cm in length, over a long period in summer. Self seeds freely. Well drained soil. Tolerates partial shade. Forum comments: Tall, upright habit, even after wind and rain, to 1.4m. Small, delicate lemon-yellow flowers. Good late season flower. Fresh lime-yellow foliage. Bold, large leaf. Good presence. Best in damp soils and performs particularly well in the north of the UK.
Nepeta Trial 2018–2021 9 Nepeta grandiflora ‘Summer Magic’ AGM (H7) 2021 Description: A compact, upright perennial to 40cm tall with ovate, grey-green leaves and densely-clustered, tubular, violet-blue flowers carried on spikes from summer into early autumn. Forum comments: Floriferous and impactful. Holding some flower and colour late into the autumn. Neat shape. Not splitting. Long flowering spikes. Grey foliage. Sturdy yet airy. Good ratio of flower to foliage. Full racemes of rich mauve-blue flowers held nicely above the foliage. Dark stems. Open but tidy habit. Selfcleaning. Silvery seed heads. Nepeta grandiflora ‘Wild Cat’ AGM (H7) 2021 Description: A clump-forming perennial with an open habit and grey-green leaves on reddish stems. Upright spikes of large soft blue flowers with red calyces, are produced from summer through to autumn. Height to about 1m. Forum comments: Good foliage, dark stems. Sturdy habit and strong stems. Deep mauve-blue flowers. Good mid-season flower. Floriferous, and evenly spread. Plenty of interest over the season and holds shape well.
10 Nepeta Trial 2018–2021 Nepeta nuda ‘Purple Cat’ AGM (H7) 2021 Description: A strong stemmed, clump-forming, upright perennial to about 1.5m. Greygreen leaves and tall spikes of pale lilac purple flowers in summer. Longflowering. Forum comments: Floriferous. Strong, tall, upright habit. Standing well. Good dark stems. Floriferous. Full heads of flower. Good presence. Airy vertical accent. Holds up reasonably well. May need light support. Neat seed heads. Well suited to contemporary planting with grasses. Nepeta grandiflora ‘Zinser’s Giant’ AGM (H7) 2021 Description: A bushy perennial to about 90cm tall with greygreen, oval to rounded leaves. Blue-violet, tubular flowers are borne from summer into autumn. Forum comments: Large mounded habit. Early season flowering with good re-bloom in autumn. Good strong mauve-blue flowers. Standing well. Very floriferous. Holding flower spikes well above foliage.
Nepeta Trial 2018–2021 11 Nepeta nuda ‘Romany Dusk’ AGM (H7) 2021 Description: A strong stemmed, bushy, clumpforming perennial with tall, dark stems. Wrinkled grey-green leaves and upright spikes of pale lilac flowers throughout the summer. Height to about 1.7m. Forum comments: Upright, and architectural. Tall but self-supporting. Airy habit. Floriferous. Nice contrast between dark stems with reddish rib and soft lilac pink flowers. Long upright seed heads. Nepeta racemosa ‘Amelia’ AGM (H7) 2021 Description: A clump-forming perennial with an attractive habit and silvery grey-green leaves. Upright stems produce many pale pink flowers throughout summer. Height to about 90cm. Forum comments: Neat and uniform. Shedding spent flowers cleanly. Very distinct lilac-pink flower colour. Long-flowering and floriferous. Bushy habit. The only grey-leaved pinkflowered Nepeta that consistently survives over winter.
12 Nepeta Trial 2018–2021 Nepeta racemosa ‘Superba’ (synonym N. × faassenii ‘Superba’) AGM (H7) 2021 Description: A compact, evenly shaped clump-forming perennial with silver grey-green leaves. Upright stems of violetblue flowers with red calyces throughout summer. Forum comments: Attractive dark calyx. Soft foliage. Good re-blooming and longevity of flower. Self-cleaning. Longest flower spikes of the racemosa types. Does not need to be cut back after flowering to provide good display later in season. Flowers are mauve-blue with dark calyx, and held well above the foliage. Nepeta racemosa ‘Walker’s Low’ AGM (H7) 2012, reconfirmed 2021 Description: A clump forming bushy perennial with grey-green leaves. Many small lavenderblue flowers in spikes throughout summer. Height varies with growing conditions from 60cm to 90cm. More sprawling in richer soils. Forum comments: Sturdy, floriferous. Attracting many bees. Long flowering period.
Nepeta Trial 2018–2021 13 Nepeta ‘Six Hills Giant’ AGM (H7) 2021 Description: A vigorous clumpforming, billowing perennial with greygreen leaves. Many spikes of lavender blue flowers in summer. Height to about 1m. Forum comments: Flowers held well above the foliage on long stems. Floriferous, with lovely deep, rich blue flowers. Long flowering and holding plenty of colour through the season. Self-cleaning. Good plant regardless of cultivation regime with plenty of re-bloom. Full, uniform mounds. Nepeta subsessilis Nimbus (‘Yanim’) AGM (H7), subject to availability Description: A perennial to about 60cm tall and 30cm wide with upright stems bearing pale to mid-green, bluntlytoothed leaves. Whorls of violet-blue flowers to 2.5cm long are borne on long spikes from summer into autumn. Forum comments: Healthy, large foliage. Fairly lax habit. Clean, fresh mid-green foliage. Floriferous. Distinct paler mauve-blue flowers with a heavily spotted lip. Large flower head. Sheds old flowers well. Long flowering. Purple hue to seed heads.
14 Nepeta Trial 2018–2021 Nepeta subsessilis ‘Washfield’ AGM (H7) 2021 Description: An upright, clump forming perennial with serrated green leaves. Spikes of many large deep blue flowers through summer. Height to about 1m. Forum comments: Large deep mauve-blue flowers with a heavily spotted lips. Calyces deep-purple. Stands well, holding shape. Broad foliage. Good flower impact, and presence. Very floriferous. Large, striking flower heads. Standing well. Structurally very good with dusky-pink stems – well-spaced foliage. Nepeta subsessilis ‘Sweet Dreams’ AGM (H7) 2021 Description: An upright, clump forming perennial with serrated green leaves. Upright spikes of lavender-purple flowers flushed with pale pink from darker calyces through summer. Height to about 75cm. Forum comments: Good habit, nicely open. Floriferous. Fresh, light-green foliage. Large seed heads with purple-red hue. Orange-brown burnish to foliage in autumn. Distinct pale pink flowers with a heavily spotted lip. Contrasting colour tones – pink blush, darker calyx. Neat, airy habit. One of the best pale pinks.
Nepeta Trial 2018–2021 15 Nepeta ‘Weinheim Big Blue’ AGM (H7) 2021 Description: A vigorous, bushy perennial with large, wide, toothed leaves. Sturdy stems bear spikes of deep violetblue flowers through summer. Height 75–100cm. Forum comments: Tidy habit. Strong and floriferous. Flowers are deep mauve-blue with a heavily spotted lip. Self-cleaning. Long flowering. Strong presence. Stands well. Good seed heads, autumn colour and airiness. A moderate runner. Best in moist soil. Nepeta ‘Weinheim Summer Blues’ AGM (H7) 2021 Description: A vigorous, bushy perennial with large, toothed leaves. Sturdy stems bear spikes of deep bluepurple flowers through summer. Height 75–100cm. Slightly less vigorous than ‘Weinheim Big Blue’. Forum comments: Floriferous. Good balance of foliage to flower, and good colour contrast. Airy, elegant habit. Holding upright. Clean foliage. Good flower colour, mauve-blue with a heavily spotted lip. A moderate runner. Sound seed heads. Nice form. Best in moist soil.
16 Nepeta Trial 2018–2021 The forum recommended to rescind the Society’s AGM from the following entries: Nepeta racemosa AGM (H7) 2002 Forum comments: Neat, shy on flower, lacks impact. Sparse re-flower. Tends to open up at centre, skirting. Nepeta sibirica ‘Souvenir d’ Andre Chaudron’ AGM (H6) 2012 Forum comments: Poor. Sprawling. Messy. Running aggressively. Very open habit. Variable. Pale blue flower. Pretty but open, lax habit. Nepeta × faassenii AGM (H7) 2002 Forum comments: Variable and plants lack uniformity. Sparse on flower. Unremarkable flower colour. Messy habit. Splitting and opening badly in centre.
Nepeta Trial 2018–2021 17 • Nepeta nervosa ‘Pink Cat’ • Nepeta nuda • Nepeta nuda ‘Alba’ • Nepeta nuda ‘Anne’s Choice’ • Nepeta nuda ‘Isis’ • Nepeta nuda ‘Lake Sevan’ • Nepeta nuda ‘Purple Cat’ • Nepeta nuda ‘Romany Dusk’ • Nepeta nuda ‘Snow Cat’ • Nepeta nuda ‘Two Tone’ • Nepeta parnassica • Nepeta ‘Porzellan’ • Nepeta ‘Poseidon’ • Nepeta prattii • Nepeta ‘Purple Haze’ • Nepeta racemosa • Nepeta racemosa ‘Alba’ • Nepeta racemosa ‘Amelia’ • Nepeta racemosa ‘Blauknirps’ • Nepeta racemosa ‘Felix’ • Nepeta racemosa ‘Grog’ • Nepeta racemosa ‘Little Titch’ • Nepeta racemosa RCBAM3 • Nepeta racemosa ‘Senior’ • Nepeta racemosa ‘Snowflake’ • Nepeta racemosa ‘Superba’ • Nepeta racemosa ‘Toria’ • Nepeta racemosa ‘Walker’s Low’ • Nepeta ‘Rae Crug’ • Nepeta ‘Rotherbridge Blue’ • Nepeta sibirica • Nepeta sibirica ‘Altai’ • Nepeta sibirica ‘Souvenir d’André Chaudron’ • Nepeta ‘Six Hills Giant’ • Nepeta ‘Six Hills Gold’ • Nepeta stewartiana • Nepeta stewartiana BWJ7999 • Nepeta subsessilis • Nepeta subsessilis Nimbus (‘Yanim’) • Nepeta subsessilis ‘Washfield’ • Nepeta subsessilis ‘Blue Dreams’ • Nepeta subsessilis ‘Blue Panther’ • Nepeta subsessilis ‘Candy Cat’ • Nepeta subsessilis ‘Cool Cat’ • Nepeta subsessilis ‘Laufen’ • Nepeta subsessilis ‘Pink Dreams’ • Nepeta subsessilis ‘Pink Panther’ • Nepeta subsessilis ‘Sweet Dreams’ • Nepeta subsessilis pink-flowered • Nepeta teydea List of plants trialled • Nepeta ‘Blue Dragon’ • Nepeta cataria • Nepeta cataria ‘Citriodora’ • Nepeta ‘Chettle Blue’ • Nepeta clarkei • Nepeta cyanea (syn. N. kubanica) • Nepeta cyanea dark form (syn. N. kubanica dark form) • Nepeta cyanea ‘Summer Wine’ (syn. N. kubanica ‘Summer Wine’) • Nepeta ‘Dropmore’ • Nepeta ‘Early Bird’ • Nepeta × faassenii • Nepeta × faassenii ‘Alba’ • Nepeta × faassenii ‘Blue Wonder’ • Nepeta × faassenii ‘Crystal Cloud’ • Nepeta × faassenii ‘Gletschereis’ • Nepeta × faassenii Junior Walker (‘Novanepjun’) • Nepeta × faassenii ‘Kit Cat’ • Nepeta × faassenii ‘Purrsian Blue’ • Nepeta × faassenii ‘Select’ • Nepeta ‘Florina’ • Nepeta govaniana • Nepeta granatensis • Nepeta grandiflora • Nepeta grandiflora ‘Blue Danube’ • Nepeta grandiflora ‘Blue Elf’ • Nepeta grandiflora ‘Bramdean’ • Nepeta grandiflora ‘Dawn to Dusk’ • Nepeta grandiflora ‘Pool Bank’ • Nepeta grandiflora ‘Summer Magic’ • Nepeta grandiflora ‘Wild Cat’ • Nepeta grandiflora ‘Zinser’s Giant’ • Nepeta Helderblauw 2 • Nepeta ‘Hill Grounds’ • Nepeta ‘Joanna Reed’ • Nepeta ‘Lamendi’ • Nepeta latifolia • Nepeta latifolia ‘Super Cat’ • Nepeta ‘Leeds Castle’ • Nepeta ‘Limelight’ • Nepeta manchuriensis ‘Manchu Blue’ • Nepeta ‘Maurice’ • Nepeta melissifolia • Nepeta transcaucasica • Nepeta Neptune ‘Bokratune’ • Nepeta nervosa • Nepeta nervosa ‘Blue Carpet’ • Nepeta nervosa ‘Blue Moon’ • Nepeta nervosa ‘Forncett Select’
18 Nepeta Trial 2018–2021 • Nepeta transcaucasica ‘Blue Infinity’ • Nepeta ‘Veluws Blauwtje’ • Nepeta ‘Weinheim Big Blue’ • Nepeta ‘Weinheim Summer Blues’ • Nepeta yunnanensis Suppliers to the trial Fi Reddaway - National Collection Holder, Plant Heritage Avondale Nursery – avondalenursery.co.uk Walberton Nursery – tristramplants.co.uk Wisley Plant Centre – rhs.org.uk/wisleyplantcentre Other plants sent by individuals – c/o the Trials Office
Nepeta Trial 2018–2021 19 For more information Details of current and past RHS Plant Trials and other colour illustrated reports can be found online at rhs.org.uk/trials-awards The Nepeta with an RHS Award of Garden Merit (AGM) listed within this report are correct as of June 2022. The AGM is reviewed according to a rolling programme to ensure the standard of gardenworthiness is maintained. First published in 2022 by the Royal Horticultural Society: Trials Office, RHS Garden Wisley, Woking, Surrey, GU23 6QB Email: [email protected] Prepared by Karen Robbirt Trial No. 2050 RHS Registered Charity No: 222879/SC038262 rhs.org.uk © Royal Horticultural Society
