Answer: Lucky you with all that sun! Sunflowers, especially the standard old-fashioned types, are a pretty tough lot and can stand a little abuse and some drought. They do prefer soil on the neutral to alkaline range, but still, they are tough plants. And although I almost always will recommend soil amendments if possible, it just may be in this case that they are not needed. If I were gardening there, I would try it both ways! I would take two plots, amend one and plant sunflowers in both areas and compare how they do. My guess is that they will do about the same, indicating little need for amendment for these hardy annuals. By the way, the rocks may be a plus for the tall heavy-headed sunflowers, anchoring them in the ground. Enjoy your sunny days!
Q&A Library Searching Tips