I'm quite certain the addition of superphosphate to the many daffodils that I've planted that only leaves and no flowers show up in the spring will turn things around. Especially since I have report that tells me my soil is very low in phosphorous. I'm guessing that making a hole next to the daffodils and filling with triple superphosphate would help. Or would laying the product on the soil get similar results. A picture of the tool to make a hole next to bulb is included.
Adding Superphosphate to Existing Bulb Plants
Certified GKH Gardening Expert
Interesting technique you have thought up, and I would say go for it!
You do need to water the bulbs to get the fertilizer to them.
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