Eastern Tiger Swallowtail Butterfly: Facts, Host Plants and more Wondering when to harvest sunflower seeds? Timing is everything. , If you want big, fully developed edible seeds, dont rush it. You can cut the head when its yellow if you need to protect it from HOW TO: Grow an Avocado Tree from Seed Instant Plant Food Simply the Best Houseplant Mister Spray Bottle Hollyhock Seed Pack The Shops at Mount Vernon