Gypsum Powder for Mushroom Substrate (1 lb), Lab Grade, Garden Soil Amendment (Calcium Sulfate Dihydrate), Packaged in HEPA Enclosure

This gypsum powder worked great for my avocado trees. I have a few of them in large planters. They were all getting lots of brown leaves, despite plenty of water and not too much sun. After searching online I found that a common issue in planters is salt buildup, and that a good way to fix this is to mix gypsum powder into the soil. I looked at a few brands on Amazon and this one had good reviews and a reasonable price. It worked great for my avocados. I mixed a few cups of powder into the topsoil in each planter. It's a very fine power so it mixes easily and washes into the soil with normal watering. After a few weeks my trees looked a lot better. They dropped the brown leaves and got a lot of fresh new green growth, and have been thriving since. So, I think the salt buildup really was the problem in my case and the gypsum powder cleared it up.

Although a very good product, the delay in shipping was annoying

High quality and easy to use. Plants love it.

Excellent product.

Works well on yukas