Petrea
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| Standard Cyclopedia of Horticulture |
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Petrea (Robert James Lord Petre, 1710-1742, a patron of botany who had the finest collection of exotic plants in Europe). Sometimes spelled Petraea. Verbe- naceax. Tropical American woody plants, one of which is a choice blue- or purple-flowered climber. Twining or arborescent shrubs: lvs. opposite, leathery, pinnate-veined: fls. violet, purple or bluish, in long terminal racemes; calyx with 5 scales in the throat; calyx-lobes colored during anthesis but often becoming green and rigid in fr.; corolla usually a little more intensely colored; limb 5-cut, oblique, the tube short and cylindrical; stamens 4, didynamous; ovary imperfectly 2-loculed; locules 1-ovuled: fr. included in calyx, indehiscent, 2-celled and 2-seeded or 1-seeded by abortion.—Species about a dozen, Mex., W. Indies to Brazil. Petrea is well adapted to be grown with other stove climbers. The plants do well when trained to a balloon- shaped or flat wire frame, to pillars, or carried near the roof, where they add greatly to the beauty of the house. When it is intended to plant them out in the border, the first point to be considered is the drainage in the pot. This is best effected by placing a layer of brick rubbish of about 4 to 5 inches. This will keep the compost from becoming sour or stagnant in the pot. For a compost, use turfy loam four parts, turfy peat one part, well-decayed cow-manure one part, with admixture of a liberal quantity of sharp gritty sand. By the end of January the temperature may be increased to about 62° for night with 10° to 15° higher by day. Just as soon as they show renewed vigor they will not stand to become dry at the roots. They will want a good syringing over and under the foliage every morning on bright days. Give enough ventilation to keep the air pure and sweet. In midsummer they need some shade if only during the most powerful sunshine. When they are well established, they will be benefited by liquid manure once a week. For midsummer the temperature may be allowed to run up 80° or 85° with sun, and a night temperature of 70°. They are easily propagated from shoot-cuttings placed in a brisk bottom heat and subjected to the usual condition of moisture and shade required for other plants. When they are wanted to grow in pots, keep shifting until they are in 8- or 10- inch pots. The compost may be renewed in the spring. (J. J. M. Farrell.) CH
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References
- Standard Cyclopedia of Horticulture, by L. H. Bailey, MacMillan Co., 1963
