Bagging the hole

I live in an area where my outdoor bush garden needs to be irrigated throughout the summer. To save water, I placed a garbage bag at the bottom of each hole I dug to add good soil for my plants. I reasoned that the water and nutrients won’t simply drain right through the bottom of the holes. I think it will limit root growth to about a foot deep, but the roots’ horizontal growth is unlimited. What do you think?
Buddy,
Internet

I think that that is a good way of holding water in fast draining soils. As you thought, the roots will travel the route of the water and nutrients and grow horizontally until the water heads downward again, then they will start growing down. I would have dug the hole a little deeper, one and a half to two feet deep, before laying down the bag. This would have added stability to the roots.

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