Here’s how to plant succulents in a driftwood or old log planter:
You can use driftwood, or any piece of wood that has some age and weathering to it. Soft woods will make a faster, easier project.
Start with a crack or depression that is somewhat towards the middle of the wood. Use a gouge tool to dig it out and make more space for your plants. You don’t have to dig out very much: succulents don’t need a lot of root space.
If the crack goes all the way through the wood, tuck in a piece of screen and secure it with a couple of small nails, tacks, or staples.
Fill with dirt. I have been gardening with succulents forever and I’ve rarely used a cactus potting mix. I just use whatever potting soil I have on hand, which is usually the cheapest one, and my succulents have always been fine.
Arrange your succulents. Go for either uniformity or as dramatic a mix of colors and shapes as you can find. If you’re doing a mix, do a spike, a rosette, a silver, a green, and a purple or black. Put in your bigger forms and then tuck the little ones around the edges.
You don’t need to leave them room to grow. Pack them in there like you are arranging flowers. If they make babies, pop them out and repot when things get crowded. If they get leggy, snap off the stems and stick the rosettes back in the dirt. That’s it. They don’t have strong roots so they are as easy to rearrange as cut flowers.
Source: tended.wordpress.com