I have done tomatoes in a 5-gallon bucket here in hot and sunny California. I put the holes in the side about 3 inches up since I'm gone during the day and at the time I didn't have automated irrigation. It worked pretty well considering. I think the biggest problem was irregular hand watering on my part especially during heat waves. Getting one of those cheap Rainbird kits that has the timer was the best thing I've done for my garden.
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