I've been using Hi-Yield Grub Free Zone III for about 10 years to treat our Agave plants. During that time we haven't lost any of the plants. Neighbors have complained they cannot grow the Agave because the grubs keep eating the roots. We have many, some as tall as 6 feet. I have recommended this product to many people because if used correctly I know it works. DoMyOwn offers free shipping and I was pleasantly surprised when I learned they had not increased their price since I bought the last bag a few years ago.