| Picture | Plant Name | Botanical Name | Plant Description |
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| Double Japanese Kerria | Kerria japonica 'Pleniflora' | Graceful deciduous shrub with more upright growth than the species. Flowers appear in early-spring, many times around Easter, so it is sometimes called an Easter Rose. Bright-yellow flowers are double on this variety. Arching stems are slender and have a nice green color that remains throughout the winter. Flowers look the best in part-shade and will fade in full-sun. |
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| Early Hybrids Red Hot Poker | Kniphofia uvaria Early Hybrids | Upright growing perennial. Narrow grass-like leaves grow basally. Flowers are in shades of red and orange turning to yellow at the base. Very drought and heat tolerant. Deadheading will prolong bloom time. Plant in well-drained soils. |
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| Golden Raintree | Koelreuteria paniculata | Small to medium sized deciduous tree native to Asia. Attractive pinnately compound leaves are purple-red when new, turning green as they mature and yellow in the fall. Small bright yellow flowers bloom in mid-summer turning to lantern shaped seed pods in the fall. Very hardy and adaptable to drought and poor soils. Great multi-purpose tree. |
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| Kamschatka Stonecrop | Sedum kamtschaticum | Low-growing, clump-forming perennial. Glossy, dark-green, leathery leaves are inversely lance-shaped and toothed at the tips. Bears profuse, star-shaped, bright yellow flowers in late-summer turning to orange-red seed heads. Plant in well-drained soils. |
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| Kannah Creek Buckwheat | Eriogonum umbellatum var. aureum 'Psdowns' | Spreading herbaceous perennial with masses of yellow flowers that bloom in the summer. Evergreen foliage turns purple to red in the winter. Adaptable to many soil types and tolerant of drought. |
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| Karl Foerster Feather Reed Grass | Calamagrostis x acutiflora 'Karl Foerster' | A slow-spreading, clump-forming, perennial grass with arching, mid-green leaves. Stiff, erect stems bear soft, pink-bronze inflorescences in summer, fading to buff or pale brown in late summer through winter. This naturally occuring hybrid is one of the most popular ornamental grass. Dried inflorescences retain beauty when cut and dried. Prefers full sun. |
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| Karl Rosenfield Peony | Paeonia lactiflora 'Karl Rosenfield' | Clump-forming herbaceous flowering perennial. Large mildly fragrant bright double crimson flowers bloom during late-spring. Attractive deeply lobed mid-green foliage provides appeal even when not in bloom. Plant in fertile well-drained soils. Tolerates some drought once established. |
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| Karmina Geranium | Geranium x cantabrigiense 'Karmina' | Low-growing herbaceous perennial that spreads by rhizomes. Under preferrable conditions it can form a dense mat. Produces masses of dark pink flowers in spring. Dark green foliage is rounded and slightly lobed. |
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| Katherine Garden Phlox | Phlox paniculata 'Katherine' | Upright growing perennial. Produces abundant lilac blue flowers in tight clusters. Dark, lance-shaped leaves grow on stiff upright stems. Provide good air circulation to prevent powdery mildew. Not very drought tolerant, may need extra watering at certain times. |
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| Keeled Garlic | Allium carinatum subsp. pulchellum | Low-growing perennial related to the garden onion. Produces beautiful dark-pink to rosy-red flowers in summer. Enters dormancy once flowering is finished. |
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| Kelsey Dwarf Dogwood | Cornus sericea 'Kelseyi' | Small, mounding cultivar of Redtwig Dogwood. Striking dark red branches especially visible in the winter. Oval to lance shaped dark green leaves turn red to orange in fall. Late-spring brings white flowers turning to white berries in the fall. Berries may be mildly toxic to humans (may cause stomach ache) but a favorite of animals. Tolerates a wide range of soils but prefers moist. |
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| Kent Beauty Oregano | Origanum 'Kent Beauty' | Trailing semi-evergreen perennial. Not reliably winter hardy. Grown primarily for ornamental and not culinary purposes. Bright green leaves are aromatic but not to the same degree as culinary oregano. Pink hop-like flowers bloom beginning in June continuing into the early-fall. Drought and heat tolerant. |
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| Kentucky Bluegrass | Poa pratensis | Cool-season turf-grass with attractive blue-green foliage. Most popular turfgrass in Utah. Grows best when temperatures are cool but will struggle during the summer. Requires a significant amount of water to remain green during the summer but will be healthier if watering is applied at the proper amounts. Proper irrigation typically involves decreasing irrigation frequency while increasing system run-time. For more information go to: www.slowtheflow.org or call 1-800-SAVE-H20 for a free water check. |
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| Kentucky Coffee Tree | Gymnocladus dioica | Very tall deciduous tree with an oval crown shape. Native to east and central North America. Large leaves are made up of small dark green leaflets. Large panicles of inconspicuous whitish green star-shaped flowers appear in late-spring. Large brown seed pods follow which will require some clean-up. Very nice winter look. Very tolerant of alkaline and infertile soils. Drought tolerant once established. Can become a very large tree so allow room to grow. |
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| Kingan Fruitless Mulberry | Morus alba 'Kingan' | Vigorous spreading tree. Deeply veined leaves are large and glossy. Foliage turns yellow in the fall. Insignificant flowers appear in the spring. This cultivar is more salt and drought tolerant than the species. Adaptable to a wide range of soils and types. |
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| Kinnikinnick | Arctostaphylos uva-ursi | Low-growing mat-forming evergreen shrub. Shiny leathery dark green leaves may become reddish-brown during the winter. White flowers tinged with pink appear in spring. Red berries are eaten by birds but not recommended for human consumption. Extremely winter hardy. Tolerates poor soil. |
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| Kobold Gayfeather | Liatris spicata 'Kobold' | Upright clump-forming perennial that is attractive to bees and butterflies. Spikes of deep purple flowers appear in the summer opening from the top downwards. Multiple stalks arise from basal tufts of narrow leaves. Will tolerate some drought and poor soils but prefers moderate amounts of water in fertile soils. Requires full sun. Makes excellent cut flowers. |
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| Korean Feather Reed Grass | Calamagrostis brachytricha | Highly variable clump-forming grass species naturally occuring in eastern Asia. Purple-red tinted, airy inflorescenses appear in late-summer to fall turning to silvery-gray in fall. Narrow 1/2" wide leaves are glossy green. Adapts to a wide range of soils if sufficient mositure is available. |
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| Krauter Vesuvius Cherry Plum | Prunus cerasifera 'Krauter Vesuvius' | Small, flowering, deciduous tree with a rounded form. Profuse light pink flowers bloom in early-spring, one of the first to bloom. Dark purple leaves provide an excellent contrast in the landscape. Requires some early pruning to develop a good shape. May produce a few small fruits, that although edible, are better left on the tree. |
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| Magenta Knautia | Knautia macedonica | Loose clump-forming perennial with numerous long lasting crimson-red, pincushion-like flowerheads that bloom on slender, branched stems from early summer to frost (with deadheading). Prefers full sun in well-drained soil. |
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