Yakushimanum
Rhododendron yakushimanum
From Japan. Forms a tight mound 1–4 ft. high. New growth is covered with a feltlike coat of whit...
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Yarrow
Achillea
Among the most carefree and generously blooming perennials for summer and early fall, several being eq...
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Yarrow
Achillea x taygetea
Native to eastern Mediterranean. Grows 1 1/2 ft. high and wide, with gray-green, divided leaves 3&ndas...
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Yaupon holly
Ilex vomitoria
Native to Southeastern United States. Grows up to 15–20 ft. tall and 10–15 ft. wide, with ...
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Yellow Asphodel
Asphodelina lutea
This Mediterranean native forms a low clump (about 9 in. high and 1 ft. wide) of blue-green to dark gr...
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Yellow Bells
Tecoma stans
Native from the southern United States to Guatemala. In mildest climates, can be trained as a tree. Wh...
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Yellow Bird Of Paradise
Caesalpinia gilliesii
From South America. Tough, fast growing shrub to 10 ft. tall, 8 ft. wide, with finely cut foliage and ...
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Yellow Coneflower
Echinacea paradoxa
Native to the Ozarks. To 2–3 ft. high, 2 ft. wide. Drooping yellow to orange-yellow rays surroun...
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Yellow Cosmos
Cosmos sulphureus
To 7 ft. tall, 1 1/2–2 1/2 ft. wide, with yellow-centered,yellow or orange-yellow single flowers. Tend...
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Yellow Flag
Iris pseudacorus
Native to Western Europe and North Africa, but naturalized in eastern North America and the Pacific No...
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Yellow Flax
Reinwardtia indica
Native to mountains from Pakistan to India. Grows 3 to 4 ft. high and wide, with deep green or grayish...
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Yellow morning glory
Merremia
Twining vines with evergreen leaves divided into leaflets and golden, 3-in. flowers like those of morn...
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