Q. You had a timely article for me on the mimosa tree. Mine started to struggle with leaf scorch. I started deep watering and I added iron, zinc, used a 15-15-15 fertilizer. After about three weeks and I had new growth on all branches and no scorch on new growth. I should have started when the
|Silk tree growing in rock mulch will always struggle|
temperature increased. Why never plant them in stones? My mimosa is in an area of about 250 square feet with stones surrounding it.
A. I think you just proved my point. Mimosa is difficult to manage in a rock landscape because these rock landscapes add nothing back to the soil. Over time, the soil becomes depleted of nutrients and organic acids because nothing is added back to the soil. The organic acids from decaying organic material help these nutrients to become available to plants.
With organic mulches they are constantly decomposing and replenishing the soil with nutrients and helping to stimulate important soil microorganisms and even worms. So by adding iron, zinc and the 15-15-15 fertilizer you began to replenish those nutrients that were depleted from your soil due to the presence of the inert rock mulch.
Some plants just do not do well under rock mulch and mimosa is one of them. Your other option is to add these fertilizers every year and in some way try to compensate for having that rock mulch. Either way is fine. Your choice. But you will have to add your fertilizer combinations annually for your mimosa to do well.