Obviously, if you grow perennials the first thing you want to look at is using your cold or unheated greenhouse space as a vernalizing area for perennial crops. Most perennials that require vernalization, need a minimum of 6-8 weeks at or below 40°F (4°C), but longer is fine, so you can order your perennials liners in fall, put them in cold storage and have bigger, higher quality liners in spring. As long as your greenhouses stay above freezing there are some gorgeous annuals that will also grow at 40 to 50°F when you get closer to spring. Cold greenhouses can still be moneymakers, so use them to generate more profits!
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Dolce® and Primo® Heuchera