My delphiniums haven't come up yet, 4 month fertilizer
Delphiniums are usually short-lived; yours may have seen its last season. Many people grow them as cool-season annuals. As to the fertilizer that you are seeing in the soil, it's spent, too. Reapply this year. Better still, use organic matter like compost to enrich the soil, which will make your plants healthier.
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