Fertilizing Iris in Minnesota
Hi… In the past I have purchased iris fertilizer from Anderson Iris in Forest Lake.
their formula is 6-24-24……. Can you comment on this formula for beared iris or suggest another?
thank you Chris
Ramsey County Minnesota
We always recommend a soil test before fertilizing. The tests are easy and inexpensive. Here is the website of the soil testing lab:
Since you don't have a soil test result, I can't comment about how appropriate the fertilizer is. The only comment I can make is that iris should not have high nitrogen fertilizer, since high N makes plants produce foliage at the expense of bloom. The fertilizer you mention is low in nitrogen. It would be appropriate, if used at the proper rate and if a soil test report shows deficiencies in P and K. Read here about growing iris in Minnesota: