The Garden Guide

Book: Gardening Science - Soils, Manure and the Environment
Chapter: Chapter 3: Heat, Light and Electricity

Solar heating

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1329. The heat of the sun is the cause of growth, and its light the cause of maturity, in the vegetable kingdom. This is universally acknowledged: animals will live without light, or with very little; but no plants whatever can come to perfection without the presence of light. The agency of electricity in vegetation is less known.