This was a complete accident that helps me know when to water my large potted, topdressed, or very spiny succulents, in other words plants where I can't get my fingers easily into the soil to any depth. They all spend summers outside, and since we keep our yard as habitat rather than suburban lawn, the grass goes to seed. Some of that seed found its way into the pots where it sprouted and I didn't pull it out. The grass, being more water sensative than the succulent, is a good indicator. When the grass is wilted, the pot is very dry. It amazes me how long it takes sometimes, without it I would have watered a plant that now obviously doesn't need it. Since these conditions are not optimum for the grass, it doesn't take over the pot. I think it looks nice, too.
Just a thought about something that works for me...

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may God bless the WHOLE world!