Althaea Officinalis Marsh Mallow
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Thomas’s Favourite 50 List Curated by Thomas McBride From research data collected and collated at the National Botanic Garden of Wales NB: Butterflies and Moths are not studied at the NBGW so any data on nectar plants beneficial for them is taken from Butterfly Conservation Map Maps depict the native area of the plant (in green) Guide to using these pages: They also show areas the plant is naturalised (in purple) Latin Binomial All maps shown Name are derived from ‘Plants of the Common World Online’; English courtesy of Kew Name Gardens Flowering Period Photograph (this is when it is good of the plant for pollinators!) in flower Plant Family Insect groups known to Growing habit favour the and mature size nectar of this of the plant plant Useful knowledge or warnings about the plant RHS AGM cultivars of this species (or a related species occasionally) i Key to these Pages Warnings Additional information on these garden plants This plant would The flowers only be suitable for and/or leaves meadow-style have a Pleasant Plant tissue is highly planting scent toxic if ingested The plant has edible parts that are Sap may cause irritation Plant is often used in commonly eaten or (Wash hands after touching traditional Herbal Remedies used in cooking or avoid touching) ii Temperature RHS Hardiness Scale Some of the plants listed in our Top 200 are not fully H1a - Above 15ºC hardy in all or some parts of the United Kingdom. H1b - Minimum 10ºC Plants without a thermometer symbol are fully hardy in the severest UK Winter; equating to H5 or hardier. H1c - Minimum 5ºC Plants with a coloured thermometer symbol are hardy to varying degrees as follows: H2 - Minimum 1ºC H3 - Minimum -5ºC H4 - Minimum -10ºC H5 - Minimum -15ºC Almost Hardy Half-Hardy Not Frost Hardy Not Hardy (H4) (H3) (H2) (H1) iii Pollinators Our data on pollinators has been collected from studies spanning over a decade. Pollinator symbols appear when plants are proven to be good nectar (a) (b) plants for certain insects. It should be noted that all bee and hoverfly data is ours but lepidoptera data is taken from Butterfly Conservation. Our data spans a wide range of different insect species. For simplicity, these species have been condensed into six easy icons to represent them: (c) (d) a) Honeybees c) Bumblebees e) Moths b) Hoverflies d) Butterflies f) Solitary Bees (Includes Moths) (e) (f) iv Althaea officinalis Afro-Eurasia Marsh Mallow None Midsummer - Early Autumn Malvaceae Mallow Family 6ft Perennial Photograph from Flickr by Gertjan van Noord Marshlands 1 Anemone nemorosa Wood Anemone Europe ‘Allenii’ Spring . ‘Robinsoniana’ Ranunculaceae Buttercup Family <1ft Tuberous Photograph © Thomas McBride 2 Aquilegia chrysantha N. America Golden Columbine ‘Yellow Queen’ Late Spring - Early Summer Ranunculaceae Buttercup Family 4ft Perennial Photograph from Flickr (CC) F D Richards 3 Argyranthemum frutescens N. America Marguerite Daisy Macronesia Ssp. canariae Early Summer - Mid Autumn ‘Cornish Gold’ Asteraceae Daisy Family 2ft Perennial * Will not survive a frost, only half-hardy, Photograph from Flickr (CC) Peter Stenzel bring indoors in winter. Recommended pot4 plant. Armeria maritima Europe Common Thrift ‘Vindictive’ Late Spring - Midsummer Plumbaginaceae Leadwort Family 1ft Perennial Photograph from Flickr (CC) Derek Winterburn 5 Buddleja davidii China Common Butterfly Bush ‘Black Knight’ Summer . ‘Dartmoor’ Scrophulariaceae Figwort Family Large Shrub Photograph © Thomas McBride 6 N. America & Caltha palustris Eurasia Marsh-marigold Species Spring . Ranunculaceae Buttercup Family 1ft Perennial Photograph © Thomas McBride Semi-Aquatic 7 Campanula persicifolia Eurasia Peach-leaved Bellflower ‘Pride of Summer . Exmouth’ Campanulaceae Bellflower Family 2ft Perennial Photograph from Flickr (CC) Anita 8 Centaurea nigra Europe Common Knapweed None Summer . Asteraceae Daisy Family 3ft Perennial Photograph © Thomas McBride 9 Cistus x purpureus Mediterranean Purple Rock-rose Cistus ladanifer x Cistus creticus Cistus Cistus ladanifer creticus -Hybrid- Summer . ‘Betty Taudevin’ Cistaceae Rock-rose Family Small Shrub Photograph from Flickr (CC) Franco Folini 10 Corydalis flexuosa Chinese Blue Corydalis China ‘Blue Panda’ Spring . ‘Purple Leaf’ Papaveraceae Poppy Family 2ft Perennial Photograph from Flickr (CC) M’s Photography 11 Dahlia imperialis C. America Tree Dahlia None Summer . Asteraceae Daisy Family 6ft Tuberous Perennial * This plant will struggle to survive below -5’c night Photograph from Flickr (CC) James Gaither temperatures so plant in a sheltered spot and wrap the stems/mulch the base during the winter12 period. Dianthus carthusianorum Europe Carthusian Pink None Summer . Caryophyllaceae Pink Family 2ft Perennial Photograph from Flickr (CC) Xulesc G 13 Digitalis grandiflora Europe Yellow Foxglove ‘Carillon’ Summer . -Species- Plantaginaceae Plantain Family 3ft Perennial Photograph from Flickr (CC) Rikard Fröberg 14 Foeniculum vulgare Afro-Eurasia Common Fennel ‘Florence Fino’ Summer . ‘Florence Orion’ Apiaceae Carrot Family 5ft Perennial Photograph from Flickr (CC) Katy Wrathall 15 Geranium x magnificum Caucasus Purple Cranesbill Geranium ibericum x Geranium platypetalum Geranium ibericum Geranium platypetalum - Hybrid - Summer . Geraniaceae Cranesbill Family 2ft Perennial Photograph from Flickr (CC) Hornbeam Arts 16 Gladiolus communis Eastern Gladiolus Caucasus & Mediterranean Subsp. byzantinus Mid Spring - Early Summer Iridaceae Iris Family 3ft Cormous Photograph from Flickr (CC) John Winder 17 Hyacinthoides non-scripta Europe English Bluebell None Spring . Asparagaceae Asparagus Family 1ft Bulbous Photograph from Flickr (CC) Peter O’Connor 18 Hypericum addingtonii Hypericum x hidcoteense Europe China Garden St John’s Wort Hypericum calycinum x Hypericum x cyathiflorum* S. Asia Hypericum calycinum Hypericum hookerianum ‘Hidcote’ Midsummer - Early Autumn Hypericaceae St Johns Wort Family Medium Shrub * Hypericum x cyathiflorum is a cross between Photograph from Flickr (CC) Allan Harris H. addingtonii and H. hookerianum19 Impatiens noli-tangere Yellow Balsam N. America & Eurasia None Summer . Balsaminaceae Balsam Family 4ft Annual Photograph © Thomas McBride Marshlands 20 Kalmia latifolia N. America Mountain-laurel ‘Freckles’ Mid Spring - Early Summer ‘Pink Charm’ Ericaceae Heather Family Medium Shrub Photograph from Flickr (CC) Nicholas A. Tonelli 21 Kerria japonica Japanese Marigold-bush East Asia ‘Golden Guinea’ Late Spring - Midsummer ‘Pleniflora*’ Rosaceae Rose Family Medium Shrub * Double flowered cultivars are not good for most pollinating insects so try to buy single flowers when possible Photograph from Flickr (CC) A. Qiao 22 Knautia arvensis Eurasia Field Scabious None Midsummer - Early Autumn Caprifoliaceae Honeysuckle Family 4ft Perennial Photograph © Thomas McBride 23 Laburnum anagyroides Europe Golden Chain L. anagyroides x L. alpinum Late Spring Laburnum x - Early Summer watereri ‘Vossii’ Fabaceae Legume Family Medium Tree Photograph from Flickr (CC) Maja Dumat 24 Lathyrus odoratus Italia Sweet Pea ‘Lipstick’ ‘Bristol’ Midsummer - Early Autumn ‘Solway series’ Fabaceae Legume Family 6ft Climber Annual Photograph by Thomas McBride * This plant, if sown early, should be sown inside during winter (cannot survive below -5’c night temperatures)25 Lavandula angustifolia Mediterranean English Lavender ‘Folgate’ ‘Hidcote’ Summer . ‘Miss Katherine’ Lamiaceae Mint Family Small Shrub Photograph from Flickr (CC) Peter Taylor 26 Lilium martagon Eurasia Turk’s Cap Lily - Species - Summer . Liliaceae Lily Family 4ft Bulbous Photograph from Flickr (CC) Ralf Wimmer 27 Linaria purpurea Italia Purple Toadflax Potentially ‘Canon J Went’ Early Summer - Early Autumn Plantaginaceae Plantain Family 3ft Perennial Photograph from Wikipedia (CC) C T Johansson 28 Lobelia x speciosa N. America Purple Cardinal Flower Lobelia siphilitica x Lobelia cardinalis* ‘Pink Elephant’ Midsummer - Early Autumn ‘Fan series’ Campanulaceae Bellflower Family 3ft Annual * Natural hybrid between Red and Blue Cardinal flowers. Photograph from Flickr (CC) Alwyn Ladell Map shows the range crossover where the hybrid29 is native Lonicera periclymenum Europe European Honeysuckle ‘Graham Thomas’ Late Spring - Mid Autumn ‘Serotina’ Caprifoliaceae Honeysuckle Family 10ft+ Climber/Vine Photograph from Flickr (CC) A. Qiao 30 Lychnis coronaria Rose Campion Eurasia - Species - Summer . ‘Alba’ Caryophyllaceae Pink Family 3ft Biennial Photograph from Flickr (CC) John Winder 31 Lythrum salicaria Afro-Eurasia Purple Loosestrife ‘Blush’ Midsummer - Early Autumn ‘Feuerkerze’ Lythraceae Pomegranate Family 4ft Perennial Photograph from Flickr (CC) Xulesc G Marshlands 32 Meconopsis betonicifolia Tibet Himalayan Blue Poppy Syn. M. baileyi - Species - Summer . ‘Mop Head’ Papaveraceae Poppy Family 3ft Perennial Photograph from Flickr (CC) Tim Waters 33 Oenothera biennis N. America Common Evening-Primrose None Midsummer - Early Autumn Onagraceae Willowherb Family 5ft Biennial Photograph from Flickr (CC) Andreas Rockstein 34 Paeonia lactiflora Chinese Paeony East Asia ‘Bowl of Beauty’ Late Spring - Early Summer ‘Miss America’ Paeoniaceae Paeony Family 3ft Perennial Photograph © Thomas McBride 35 Papaver cambricum Europe Welsh Poppy None Mid Spring - Early Autumn Papaveraceae Poppy Family 2ft Perennial Photograph from Flickr (CC) Jill Catley 36 Passiflora caerulea S. America Blue Passionflower - Species - Midsummer - Early Autumn ‘Constance Eliott’ Passifloraceae Passion Fruit Family 10ft+ Vine * This plant will not survive below