I have a number of large pots and window boxes which are potted up year round - bulbs in fall through spring and annuals in the summer with a few perennials like Heuchera and Primula for continuity. I find that all the commercially available "container" or "planter box"mixes consist of mainly peat moss and perlite - a light weight mix with high water retention to reduce the need for summer watering. Unfortunately in our wet winters with their regular freeze and thaw cycles these same mixes stay too wet and encourage bulbs and other sensitive plants to rot. I remove my saucers in winter and elevate the pots slightly to encourage draining, but wonder if there is a more suitable year round mix for our area? In one large planter I tried using a homemade mix with lots of bark fines, but the plants did not seem to do well at all. I replaced the soil with a container blend plus some "SeaSoil" and manure, but it still seems too wet in the Oct to March period. Does anyone have suggestions for a good commercial or homemade mix with better drainage for the wet season, but adequate moisture retention in summer? We used to put a layer of coarser material in the bottom, 'for better drainage' but some years ago I read on this forum that this actually creates worse drainage than a homogeneous mix. Apparently (because of surface tension?) the water stays in the wet soil and doesn't actually drain through the coarser material to the drainage holes. This explanation seems rather unlikely, but I'd like to hear more of other peoples experiences.