LOL. I never considered that. I actually put some pavers underneath it so it can breath. Not sure what containers you use - I use fabric pots. Once the season get's *underway*, and the potting medium does take on water and stays wet, it keeps the fabric moist. The containers get pretty disgusting - don't care much about the salt buildup vs. the green aglae that tends to grow on the outside of the pot. To the point, where I can take a hand shovel and *scrape if off* - aka, you can smell the algae if it's wet outside - hence the use of pavers so that air can float 360 and keep the fabric pot as least not as wet
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