How many drainage holes did you drill in your buckets and how large are they? If the buckets are not able to drain well, you may end up with a swampy stagnant muck at the bottom of the buckets either from overwatering or heavy rains. If you have adequate drainage and a well draining mix, then watering when needed just until you see water starting to run out the bottoms is enough.
And remember to put them on a regular fertilizing schedule as with rain and watering, nutrients will get regularly washed out of the buckets.
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