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acid aphids asparagus beans beetle beets cabbage carrots celery chard clay coldframe compost pile cool Cooperative Extension Service corn corn salad cottonseed meal crop cucumbers cultivation culture decompose develop diazinon diseases eggplant Extension Service University fall feet fertilizer flavor flowers foliage frost fruit garden centers Germination green ground growing season grown growth harvest herbs Hybrid inches between plants inches deep insects keep weeds leaf lettuce leaves lettuce mature melons moist months mulch nitrogen nutrients onions organic matter outdoors particles peas peat peat pots peppers pests phosphorus pick planters planting Germination plastic plastic mulch pods potato pull pyrethrum radishes rainfall rake roots rotenone rows salad seedlings sheet composting soil moisture soil pH sown space spinach sprouts squash stalks stems stored summer thin tiny tomatoes transplants turnip usually varieties vegetable garden vermiculite vines warm weather weeks well-rotted manure winter yellow