Plant List K
| Kalmia | latifolia | "Fresca" | A dense bushy evergreen shrub with glossy, dark green leaves and large clusters of pretty, bowl-shaped, white flowers with a burgundy band. Height 3m. Spread 3m. Moist lime-free soil in part shade. Flowers from May to July. |
| Kalmia | latifolia | "Minuet" | A dense bushy evergreen shrub with glossy, dark green leaves and large clusters of pretty, bowl-shaped, pale pink flowers with a cinnamon-maroon band. Height 1m. Spread 1m. Moist lime-free soil in part shade. Flowers from May to July. |
| Kerria | japonica | "Picta" | A deciduous, suckering shrub with grey-green leaves margined creamy white and large, long lasting, golden yellow, single flowers. Height 1.5m. Spread 2m. Well-drained soil in sun or part shade. April to May. |
| Kerria | japonica | "Pleniflora" | A suckering deciduous shrub with bright green leaves and large, pompon-like, double, golden yellow flowers in spring. Height 1.5m. Spread 2m. Well-drained soil in sun or part shade. April to May. |
| Kirengeshoma | palmata | A clump-forming perennial with pale green leaves and pretty tubular pale yellow flowers. Height 60-120cm. Well-drained soil in part shade. Aug.-Sep. | |
| Knautia | macedonica | A clump-forming perennial with basal green leaves and purple-red pincushion flowerheads. Height 60-80cm, Jul.-Sep. Well-drained soil in sun. | |
| Knautia | macedonica | "Mars Midget" | A clump-forming perennial with basal green leaves and purple-red pincushion flowerheads. Height 30cm. Well-drained soil in sun. Jul.-Sep. |
| Knautia | macedonica | "Melton Pastels" | A clump-forming perennial with basal grey-green leaves and pincushion flowerheads in shades of red,pink,purple or blue. Height 1.2m, Jul.-Sep. Well-drained soil in sun. |
| Kniphofia | "Bees Lemon" | Lemon-yellow flowers in dense heads on spikes 85cm. high. Moist well-drained soil in sun or part shade. Jun.-Sep. | |
| Kniphofia | "Brimstone" | Slender green and yellow pokers above clumps of grassy foliage. Height 75cm. Moist well-drained soil in sun. Jul.-Nov. | |
| Kniphofia | "Dingaan" | A clump forming upright perennial with strap-like bright green leaves and tall stout heads of pale bronzed-yellow flowers from bronzed-green buds. Height 1-2m. Well-drained soil in sun. Jul.-Sep. | |
| Kniphofia | "Dorset Sentry" | A clump forming upright perennial with grass-like leaves and spikes of acid yellow flowers. Height 1m. Well-drained soil in sun. Jul.-Sep. | |
| Kniphofia | "Flamenco" | A seed raised perennial with clumps of grassy foliage and flower spikes in shades of red, yellow or orange. Height 1m. Well-drained soil in sun. Jul.-Sept. | |
| Kniphofia | "Jenny Bloom" | A clump forming perennial with grassy foliage and slender coral-pink flower spikes that fade to cream. Height 70cm. Well-drained soil in sun. Aug.-Sept. | |
| Kniphofia | "John Benary" | A clump forming perennial with grassy foliage and good red-coral flower spikes. Height 75cm. Well-drained soil in sun. Aug.-Sept. | |
| Kniphofia | "Light of the World" | A clump forming perennial with grassy foliage and slender pokers of pale orange. Height 60cm. Well-drained soil in sun. Aug.-Sept. | |
| Kniphofia | "Little Maid" | Spikes of buff-tinted, pale yellow flowers over narrow grass-like, arching leaves. Height 50cm. Moist well-drained soil in sun or part shade. Aug.-Sep. | |
| Kniphofia | "Mermaiden" | A clump forming upright perennial with grass-like leaves and fat, often branched spikes of pale yellow-green flowers from green buds. Height 80cm. Moist well-drained soil in sun or part shade. Jul.-Oct. | |
| Kniphofia | "Nancy's Red" | A clump forming upright perennial with thin grass-like leaves and slender spikes of deep coral-red flowers. Height 60cm. Moist well-drained soil in sun or part shade. Jul.-Oct. | |
| Kniphofia | "Newest English Hybrids" | A seed raised strain with pastel flowers in dense heads on spikes 85cm. high. Moist well-drained soil in sun or part shade. Jun.-Sep. | |
| Kniphofia | "Royal Castle" | A clump-forming perennial with grass-like, arching leaves and flower spikes of red buds opening yellow. Height 1m. Moist well-drained soil in sun or part shade. Jul.-Oct. | |
| Kniphofia | "Samuel's Sensation" | Long narrow spikes of cream flowers open from coral-orange buds. Height 1.1m. Moist well-drained soil in sun or part shade. Jun.-Sep. | |
| Kniphofia | "Sherbet Lemon" | A clump-forming perennial with grass-like, arching leaves and bright yellow flowers in dense heads on spikes 60cm. high. Moist well-drained soil in sun or part shade. Jul.-Sep. | |
| Kniphofia | "Tawny King" | A clump-forming perennial with narrow grass-like, arching leaves and flower spikes of tawny apricot buds opening cream. Height 1.2m. Moist well-drained soil in sun or part shade. Jul.-Oct. | |
| Kniphofia | "Timothy" | Spikes of soft salmon-peach and cream flowers lined with darker salmon edges. Height 70cm. Well-drained soil in full sun. Jul.-Oct. | |
| Kniphofia | "Wol's Red Seedling" | A clump forming perennial with grassy foliage and slender red pokers. Height 60cm. Well-drained soil in sun. Jun.-Aug. | |
| Kniphofia | "Wrexham Buttercup" | A vigorous variety with dumpy spikes of clear yellow flowers from green buds. Height 1.2m. Moist well-drained soil in sun or part shade. Aug.-Oct. | |
| Kniphofia | galpinii | Spikes of orange-red flowers from Jun.-Oct. Height 90cm. Full sun in well-drained soil. Needs winter protection. | |
| Kniphofia | northiae | A species with enormous strap-like leaves and spikes of stumpy coral and beige pokers. Height 1.3m. Moist well-drained soil in sun or part shade. May-Aug. Needs space! | |
| Kniphofia | pumila | A dwarf species with grass-like foliage and spikes of lime-green pokers. Height 50cm. Moist well-drained soil in sun or part shade. Jul.-Aug. | |
| Kniphofia | triangularis | A small species with grass-like foliage and spikes of coral-orange flowers. Height 40cm. Moist well-drained sheltered site in full sun. Jul.-Oct. | |
| Kniphofia | uvaria | "Nobilis" | A clump-forming perennial with narrow grass-like, arching leaves and very tall flower spikes of orange flowers from orange buds. Height 2-4m. Moist well-drained soil in sun or part shade. Jul.-Oct. |
| Koelreuteria | paniculata | Golden-rain Tree. A spreading tree with leaves emerging red-pink turning mid-green. Small yellow flowers are followed by bladder-like pink or red flushed fruit. Height 10m. Spread 10m. Well-drained soil in sun. July to August. | |
| Kolkwitzia | amabilis | "Maradco" | A new form of the "Beauty Bush" with the foliage being orange yellow in Spring. Masses of bell-shaped bright, deep pink flowers with yellow throats. Height 2m. Spread 3m. Well-drained soil in sun. May to June. Prune after flowering. |
| Kolkwitzia | amabilis | "Pink Cloud" | A deciduous, suckering shrub with arching branches of dark green leaves and masses of bell-shaped bright, deep pink flowers with yellow throats. Height 3m. Spread 4m. well-drained soil in sun. May to June. Prune after flowering. |