Hi Melli,
I find that M. guelzowiana can be watered much as other Mamms, but it does need a very porous compost. I water all of my pots individually, with a small watering can, just up to the top of the pot, and the water drains right out through the porous soil - but that's enough. I do this about every 3-4 weeks at this time of year, in my greenhouse where temperatures are up to 32-26C.
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Chris43, moderator