Phosphorous isnt good at working its way down through layers of soil.
Do I Need to Fertilize Every key in of Spring Blooming Bulb?
Do not prune, cover, or braid the leaves.
The Spruce / Randi Rhoades
This is how the bulbs feed themselves.
you might cut off the flower stalks if you like.
This will cover a 10-square-foot area of planted bulbs.
The Spruce / Randi Rhoades
Sprinkle the mixture onto the soil and use a hand rake to work it into the soil.
This should be done before any winter mulch is applied.
An equivalent amount of “bulb food” can be substituted for the mixture.
The Spruce / Randi Rhoades
Read the product’s label instructions to ensure that you are using the correct amount.
Rake back the winter mulch and work the fertilizer into the soil.
The mulch can then be put back in place to help prevent weeds.
Do not fertilize the bulbs once they have started flowering.
Tip
Keep in mind that most spring-blooming bulbs prefer asoil pHbetween 6.0 and 7.0.
This is the pH range in which the bulbs can get into the most nutrients from the soil.
Test and amend your soil if your bulbs are struggling despite your best efforts at feeding them.
Bulbs & More.University of Illinois Extension
