Jolana, my oak leafs are in the ground. They get about 3 hours of morning sun and then a couple of hours of late afternoon sun. They are growing under large oaks/cedars and thus get dappled shade the rest of the day. I really do little to them in the winter months. I might throw a few inches of oak leaves over them after then have dropped all their leaves, but that's it. They overwinter very well and I have never lost one. They just keep increasing in size every year. We typically get down in the teens (sometimes 12F) 10-12 nights and in the 20's twice that amount, but it generally warms up above freezing the following day. Three years ago we went a week that it stayed below freezing, but the oak leafs were not harmed.
