Currently I let the reservoir go dry at the end of season so there is no standing water in the ollas as winter comes on. the ones in the greenhouse have been there for 3 yrs and no sign of deterioration from freeze thaw cycles. The outside raised bed trial is going on to year two and heavily mulched appear to be ok, so far. This bed of peppers has 6 ollas in it. The reservoir is on top left of the bed and is a marine fuel tank of 20 gallons. Depending on temp and humidity the 20 gallons lasts about 4 weeks. Chipmunks are an ever present issue so the raised beds are armored with the hardware cloth. but that gives me a table top for seed starting in the early season. The shade cloth keeps the chippers out but when thrown or rolled back gives access to the bed.
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