Rosemary Left Outside in Zone 5: An Update
Here is a pic taken 02 Jan 06 of two rosemary plants I have left outside up here in New Hampshire as an experiment. They were planted this past spring/summer and are about 12in/30cm tall . The one in front is a Hill Hardy/Madeleine Hill and the one in the rear is an Arp. The Hill Hardy (as Companion Plants calls it) looks a little browner than the Arp, but both are in full leaf with flexible stems, and the plant looks healthier live than it does in the pic. Both plants seem to be fine. They are on the south side of the house, receiving full sun most of the day. They are protected on the west side by the bulkhead doors to the basement, visible in the pic. Fallen leaves are the only mulch, which is minimal. Soil is sandy and drains very well. They are in front of the brick basement with a few bricks around them to help retain heat. Temps have been mild this winter with minimal snow, and they have only experienced a couple of days of -6F/-21C nights, so far. Normally, we get down to around -16F/-27C for a while, and it is very snowy. We still have a lot of cold, snowy weather ahead, so it remains to be seen if they will make it through a typical zone 5 winter. But, so far they have shown that in the right spot they can survive to at least zone 6.