So how do they do this??????

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Succulents in those living wall planters are usually held in by some wiring or fencing and their container is packed full of plants and moss to keep them in. The finished product is usually laid down for a month or two to allow the plants to grow and stabilize. If you want to put pots sideways, you will probably need to pack them very full and let them root well before hanging them. Look up videos of people creating succulent wreaths and walls to see the what they do to make them stay. Garden Answer has some nice videos on it.

I've always wondered the same thing. I think they use chicken wire or some sort of landscape fabric. And then that opens up a lot more question for me about drainage and drying of the soil.

Let us know if you figure it out!

so how do you water it???

You water those with drip, usually daily... but caution... they look great just after completion... a bit better a few weeks later.. then things get overgrown while other things die and eventually look terrible no matter how well you take care of them, unless you REALLY physically take care of them weekly (removing dead ones and replacing them, and pruning the overgrowing ones). These are a LOT of work to keep looking good, and I rarely have seen that happen. Great things to give as gifts... lousy gifts to get and have to take care of.