Sentence:  The pea, being a tendrilled climber, whenever it is to be cultivated to the greatest advantage, ought to be supported by pea sticks, which are branches of trees or shrubs well furnished with <WSD>spray,</WSD> and of lengths suited to the height to which the plants grow. 
Meaning of the word marked with <WSD> tags:  Branches and twigs collectively; foliage.