This planter would work great for succulents, grasses, flowers, or strawberries. I chose to use succulents of the Sedum variety but there are a lot of different options.
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To have success planting in cinder blocks you will want to use alkaline loving plants. Your also want to plant in a nice flat area. A concrete driveway or deck works well.
Supplies:
20 half-cinder blocks
potting soil
gravel
alkaline loving plants
liquid nails
Directions:
Find a nice flat spot to layout your cinder blocks. The half cinder blocks work great for this type of project.
If you plan on stacking higher than 3 high, you will want to run some rebar so that it doesn't topple over if someone bumps it. Even with a shorter version like mine, I would recommend using a little liquid nails to attach the 2nd and 3rd row of blocks.
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Once you have your layout set up, put gravel in the bottom of all the planters. Make sure to leave room for 6 inches of soil.
Fill the blocks the rest of the way with soil.
Then put in your favorite alkaline loving plants.
I like to refer to this as our Qbert planter, since it reminds of the old video games (see below).