I grow a lot of these in my nursery.
My worst experience was too much overhead water one summer, killing about 10% of them from rot. I now only water with drip, about 6 " from the trunk.
I'm in Fallbrook, and we can get hot here. They are susceptible to pythium rot at the base. Treat as a cycad in my opinion. The plants at HBG look crappy all the time, and they get overhead water. The plant in the ground by my pool gets less than two gallons a week(8' overall hieght) and looks great. I think this plant is more drought tolerent than people think.
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