I also grow smaller bulb plants with my semps, and I do grow in cement blocks. In fast, all of my semps are grown in 4 x 8 foot cement block beds. Some of the bulbs are grown in the holes of the blocks, others are planted in the beds with the semps. I find the Tulipa 'Little Beauty' can really take over an area in a hurry, it multiplies like rabbits. I think it also increases by seed very easily.
With a little thought as to seasonal coloring of the semeps you can make some very pretty pairing. I am just now figuring that out, the part about color and texture combinations with the semps.
I have the opportunity to really create some nice combinations this year. We will be moving this summer. I hope to be very thoughtful this time in the placement of plants. More planned, less accident.
