Sentence:  You may now sow upon moderate hot-beds, a few of the small Salad feeds, such as White Mustard, Rape, Cresses, and Cabbage Lettuces, and you may also sow upon other hot-beds, not to be drawn until they are pretty large and well <WSD>appled</WSD>, Radishes and Turnips, observing to sow them very thin, that the plants may have room to swell and grow; 
Meaning of the word marked with <WSD> tags:  To form buds.