I'd get a big tub/pot and fill it with loose potting soil. Nothing too rich or hot with nitrogen. The soil
should be a bit moist but certainly not dripping wet. Tightly "plant" the ramps in the soil, back-fill around them and gently firm them into place. They'll need soil firmly pressed up against their
roots to remain alive. Give them a bit of
water twice a week but not too much. Keep them in a cool location so they don't dry out and don't take off growing like crazy until you are ready to transplant them. Give them
enough exposure to filtered sunlight that they remain alive, but not so much that they grow rapidly. They should remain in semi-dormancy until you put them in the ground. A sun-porch that doesn't get too warm during the day might be a great location, just not in direct sunlight or where the pot is getting warmed up by direct sunlight. Once that soil gets 65 degrees or more, they'll want to grow.
The key—enough moisture that they remain alive without too much that would rot them. Enough filtered light that they continue to photosynthesize but not so much that they bolt. Warm enough that they don't freeze, but not so much that the soil dries out or their plant juices really start to flow. You may want to water them with just a mister to avoid getting the soil too wet. I'd go with a plastic pot or tub rather than terra cotta. It won't dry out as quickly should you forget about them for a week.
Pulling them up out of the loose potting soil will be easy, and then you can re-use that soil for other plants and projects.
OR . . . you could go to a party, hang around by the garbage can, collect 100 used red Solo cups, take a drill and drill a couple of drainage holes in all of them, and individually pot every one of those ramps in good soil in your party-scavenged cups. Then put the potted ramps in the sun and give them enough water to really get growing. Once you transplant them, they'll have a big jumpstart.
