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Plant & Garden Varieties beginning with O  10 11 12 13 14 15 16 17 18 19 20  Orontium aquaticum Succeeds in the bog garden or pond margins up to 45cm deep[56, 200], but plants do less well if they are not grown in water[188]. Requires a fertile loamy soil in full sun[200]. Plant the rootstock in at least... [MORE] Orthilia secunda Prefers a moist sandy woodland soil[111, 200] in a cool position with partial shade[1, 11, 200]. Requires a peaty or leafy but not very acid soil that remains moist in the summer[31, 187]. This is a very diffi... [MORE] Orthodon fordu Not known... [MORE] Orychophragmus violaceus Succeeds in a fertile well-drained soil in a sunny position[200]. Plants are not very cold-tolerant[188], but they can be overwintered outdoors in areas where winter temperatures do not fall below about -5°c[2... [MORE] Oryzopsis asperifolia 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 most parts of the country. One report says that t... [MORE] Oryzopsis hymenoides Succeeds in any moderately fertile moisture retentive soil in full sun[200]. This species is unlikely to tolerate temperatures lower than about -5°c, and so will only be suitable for the milder areas of the co... [MORE] Osbeckia chinensis Requires warm greenhouse treatment in Britain[1].... [MORE] Osmanthus americana We have very little information on this species and do not know if it will be hardy outdoors in Britain, though judging by its native range it is likely to be succeed outdoors at least in the milder areas of th... [MORE] 10 11 12 13 14 15 16 17 18 19 20 Page 14 of 20 containing O Varieties |