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Biennial/Perennial Varieties  1 2 3 4 5 6 7  Melilotus altissima Dislikes shade. This species has a symbiotic relationship with certain soil bacteria, these bacteria form nodules on the roots and fix atmospheric nitrogen. Some of this nitrogen is utilized by the growing pla... [MORE] Oenothera elata hookeri Prefers a dryish well-drained sandy loam and full sun. Heavy clay soils may induce winter rots. Succeeds on poor soils. The flowers open in the evening, they are richly scented and are very attractive to moths... [MORE] Picris hieracioides Prefers a dryish soil but succeeds in most soils[200]. Dislikes shade. Wild plants are an indicator of calcareous soils[200]. Seed is often produced apomictically[17]. Any seedlings from this seed will be gen... [MORE] Pleurospermum uralense We have very little information on this species and do not know if it will be hardy in Britain, though judging by its native range it should succeed outdoors in many parts of this country. Some botanists consid... [MORE] Reseda lutea Easily grown in any well-drained neutral to slightly alkaline soil in a sunny position or in some shade if the summers are long and hot[200]. Plants can sometimes be established on old mortared walls[219]. A g... [MORE] Rudbeckia hirta Succeeds in an ordinary medium soil in sun or shade[111]. Requires a moist soil[1]. Prefers a well-drained soil[188]. Dormant plants are hardy to about -25°c[187]. This species is a biennial or short-lived pe... [MORE] Salvia sclarea Requires a very well-drained light sandy soil in a sunny position[200]. Thrives on any ground that is not too wet[4]. Plants can be killed by excessive winter wet[200]. Hardy to about -20°c[187]. A biennial o... [MORE] Scolymus hispanicus Grows well in an ordinary garden soil in sun or semi-shade[200]. Prefers a rich soil[33]. This species has sometimes been cultivated in the past for its edible root[1, 2, 17, 61].... [MORE] 1 2 3 4 5 6 7 Page 6 of 7 containing Biennial/Perennial Varieties |