I am in central Florida and have not had a problem with mine. I plant mine and then mulch very heavily. The electric company tree trimmers will deliver free mulch if you need a lot. Not high quality but with 20+ trees, it does save money. With just a few trees, pine bark will work. Another option is to take a plastic 5 gallon bucket and cut out the very bottom and then cut in half. Dig your hold and place the cylinder in the ground with about 1-2 inches above the ground. Plant you fig in the hole, fill as normal and mulch. The fig roots will be forced to go deep to spread. Nematodes can only live in the top 10-12 inches of soil and need light to survive.