Yes to the slow release. I mix in osmocote and I also fertilize with an injector when I water. I do petunias, begonias, a few hanging tomatoes, fuchsias, combination hanging baskets... whatever I can get for materials whether by rooted cuttings or by seed. I started begonias in December. they are about the size of my fingernail right now. they take a long time.
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carolyn k
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