Ever since Brian started working on his planter project, I've been doing research on my own trying to figure out what sort of plants to put into it. I definitely wanted to use perennials rather than annuals if possible—partly to save money and partly to save ourselves the work of having to replant every year, but mostly because perennials get a head start. When you grow annuals, you can't do your spring planting until the soil is thoroughly thawed and the stores have spring plants available, but perennials can start to poke their heads up out of the soil as soon as they think it's warm enough.
So I did a search for something like "best perennials year round container garden," read through the first several articles that popped up, and compiled a list of the plants that earned the most recommendations. Top picks included heuchera (coral bells), boxwood, bergenia, sedum, yucca, creeping Jenny, coreopsis, salvia, asters, camellias, Japanese andromeda (Pieris japonica), and some varieties of juniper. Unfortunately, by the time both planters were ready, most of these plants—in fact, most plants of all sorts—were no longer available at local nurseries. We were able to find some coral bells and a few salvias, and we filled up the rest of the planters with filler plants—some English ivy and a couple of begonias—just to provide a bit of color. We figured we'd see which of those survived until spring and fill in around them.
For a while, it looked like the answer to that was going to be "none of them." By this week, it was apparent that the coral bells had survived, but we weren't confident anything else had. So we set out yesterday for the nursery planning to get at least four new plants for each planter—enough to replace all the ones we knew or suspected were dead. This time around, we had much better luck finding what we wanted. We got a couple of dwarf boxwood shrubs, some asters, and one bee balm. (This wasn't on my original list, but we knew it was deer-resistant—a key feature in our heavily deer-ridden landscape—and we already had another one of them in the back yard that Brian could dig up and transfer it to the other planter). We spent about $75 on that lot, and Brian planned to fill in the rest of the space with some salvias he'd been growing from seed.
But when we got the plants home, there turned out to be another wrinkle. On closer examination, it became apparent that the ivy plants at the ends of both planters were still alive, with a few tiny, yellowish leaves sprouting from each plant. In light of this development, we reworked our original layout. We put the boxwood shrubs at the other end of each planter, opposite the end with the ivy, and placed the aster and bee balm plants in between those two evergreens and the heucheras in the middle. Then Brian poked in four of the tiny salvia plants in a square around each central heuchera as filler. Assuming all these survive, they should give us a mixture of spring, summer, and fall blooms, plus some evergreens to provide winter interest.While we were at the nursery, we also grabbed one extra plant: a small pot of "elfin" creeping thyme. We've made a couple of attempts in the past to use creeping thyme as a ground cover in our hard-to-mow front yard with mixed results. One of the plants didn't survive; the other is still pretty green and healthy, but it hasn't succeeded it keeping down the grass and weeds the way we hoped it would. But the elfin thyme looked extremely dense and thick, and I recalled having seen it described as an excellent choice for ground cover. So we picked up a little pot of it for $4 and planted it in a bare patch in the front yard. (This was the spot where our cherry tree used to be; removing it had left a hollow in the ground that we eventually decided was too hazardous and filled in with dirt, but the grass never covered it properly.) If this spreads out nicely to fill in the bare spot, perhaps we'll invest in some more and deploy them elsewhere around the yard—particularly the space in between the two stakes that are supporting our plum tree, which is even harder to mow than the rest of the yard. I've tried to establish some barren strawberry in there, but they didn't grow well enough to keep down the grass. Perhaps the thyme will do the trick.