What is the ideal environment for growing rhubarb?
This site had the best information on the subject and I think it covers all the points of your question: Climate and soils Rhubarb does best in cool climates but grows reasonably well in Queensland’s sub-tropical environments, except under extremes of heat. Temperatures above 25oC will slow growth, suppress reddening of the stalks and may cause problems in plant establishment. The best stem colour is produced at about 10oC. Temperatures below –3oC will damage above ground plant parts. Rhubarb can be grown on a wide range of soil types, providing they are well drained, but prefers deep loams well supplied with organic matter. The most satisfactory soil reaction range for rhubarb culture appears to be between pH 5.6 and pH 6.5 (moderate to slight acidity). Propagation and planting Rhubarb is usually propagated by planting pieces or divisions of ‘crowns’ formed during preceding seasons. Divisions are made by cutting down through the crown between the buds or ‘eyes’ leaving a piece of stor