I'm misery about rich water draining from the fertilized containers and prefer to capture them rather than letting them drain out into the ground to feed the weeds and grass, so I put catch trays under almost all the plants on my patio. I use sturdy and weather resistant 1020 nursery flat sized Permatrays for the most part, and also have found large round shallow galvanized pans at Tractor Supply that are perfect for large containers. I like trays that are about 2 inches deep.
After it rains, I have to go out and drain all of them. Easiest method is to have an extra tray on hand, start from one end and transfer the containers to the extra tray, remove the water filled tray and dump in a bucket, go to the next tray and repeat on down the line. The bucket of captured water can be used to water next time, which with containers is most likely to be the next day or the day after.
In my case, the saved water is often mingled with rainwater but if you are only capturing your own irrigation water, and especially if you use chemical fertilizers, you may need to dilute a little for re-using.
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