I have a big bag of 5-20-5 granular fertilizer. Can this be used safely on daffodil patch, and if so, when in growing cycle?

Question

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Answer 1

Your fertilizer is very high in phosphorus. Follow instructions carefully; phosphorus can build up in the soil and reach harmful levels. If your daffodils seem to be struggling, add a small amount of nitrogen fertilizer at the end of blooms. Blood meal and composted manure are 2 examples. The following article has more information on when to fertilize.
https://www.gardeningknowhow.com/ornamental/bulbs/daffodil/fertilizing-daffodil-plants.htm