| Kalmia latifolia (AGM) |
| Kalmia latifolia 'Ostbo Red' (AGM) |
| Kerria japonica 'Golden Guinea' (AGM) |
| Kerria japonica 'Picta' (syn. 'Variegata') |
| Kerria japonica 'Pleniflora' (AGM) |
| Kolkwitzia amabilis 'Pink Cloud' (AGM) |
| Laurus nobilis (AGM) |
| Laurus nobilis 'Aurea' (AGM) |
| Lavandula angustifolia (syn.L.spica, L.vera) (AGM) |
| Lavandula angustifolia 'Alba' |
| Lavandula angustifolia 'Ashdown Forest' |
| Lavandula angustifolia 'Hidcote' (AGM) |
| Lavandula angustifolia 'Hidcote Pink' |
| Lavandula angustifolia 'Imperial Gem' |
| Lavandula angustifolia 'Jean Davis' |
| Lavandula angustifolia 'Munstead' |
| Lavandula angustifolia 'Princess Blue' |
| Lavandula angustifolia 'Rosea' |
| Lavandula angustifolia 'Twickel Purple' (AGM) |
| Lavandula 'Fragrant Memories' |
| Lavandula x intermedia 'Grappenhall' |
| Lavandula x intermedia 'Seal' |
| Lavandula 'Sawyers' |
| Lavandula stoechas (AGM) |
| Lavandula stoechas 'Marshwood' |
| Lavandula stoechas pendunculata (AGM) |
| Lavandula stoechas pedun. 'James Compton' |
| Lavandula stoechas 'Willow Vale' |
| Lavatera 'Bredon Springs' (AGM) |
| Lavatera 'Barnsley' (AGM) |
| Lavatera 'Blushing Bride' |
| Lavatera 'Burgundy Wine' |
| Lavatera 'Candy Floss' |
| Lavatera 'Kew Rose' |
| Lavatera 'Lisanne' |
| Lavatera maritima |
| Lavatera 'Pavlova' |
| Lavatera 'Rosea' (AGM) |
| Lavatera thuringacia 'Ice Cool' |
| Leptospermum scoparium 'Red Damask' (AGM) |
| Lespedeza thunbergii (AGM) |
| Leucothoe 'Scarletta' |
| Leucothoe walteri 'Rainbow' |
| Leycesteria formosa |
| Ligustrum japonicum |
| Ligustrum lucidum (AGM) |
| Ligustrum ovalifolium 'Argenteum' |
| Ligustrum ovalifolium 'Aureum' (AGM) |
| Lonicera fragrantissima |
| Lonicera involucrata ledebourii |
| Lonicera korolkowii |
| Lonicera nitida |
| Lonicera nitida 'Baggesen's Gold' (AGM) |
| Lonicera nitida 'Lemon Beauty' |
| Lonicera nitida 'Maigrün' ('Maygreen') |
| Lonicera nitida 'Red Tip' |
| Lonicera nitida 'Silver Beauty' |
| Lonicera periclymenum 'Honeybush' |
| Lonicera pileata |
| Lonicera pileata 'Moss Green' |
| Lonicera x purpusii |
| Lonicera x purpusii 'Winter Beauty' (AGM) |
| Lonicera rupicola syringantha |
| Lonicera standishii |
| Lonicera tatarica 'Arnold's Red' |
| Lonicera tatarica 'Hack's Red' |
| Lonicera tatarica 'Zabelii' |
| Lotus hirsutus 'Brimstone' |
| Lotus hirsutus (syn. Dorycnium hirsutus) |
| Luma apiculata 'Glanleam Gold' |
| Lupinus arboreus (AGM) |