Hi Marc – If your greenhouse is closed, but not heated, you can grow many vegetables in the ground, especially greens like arugula, beet greens, and lettuces. I know a few flower farms who are raising anemone coronaria and ranunculus in un-heated hoop houses. If you are in south county or near the coast, you could try some cold-hardy camellia's – check the few sources on-line who carry some new crosses created from species collected in higher elevations – most descriptions will identify them as such. Daphne odoratum is great for winter scent, but not as a cut flower, but if you plant a few shrubs in the ground (if you can), try Sarcocca (any species) or Correa for winter color. Some plants which are typically impossible to grow unless they receive cold, frozen and dry winters include primula auricula and some saxifrages, as well as many alpines, which, if you house gets ridiculously cold and remains frozen, will thrive in such conditions as long as they dont defrost and refreeze too often. So, you can see the variables – if your house is open to the ground, plant winter veggies directly in the soil – ( but these would have been best to sow in Sept). A spring crop could be sown in Feb., and late fall sown crops would provide veggies through the winter, but I would need to know more about your greenhouse conditions. For flowers, it's more challenging if the house is unheated, but if closed off from the elements, I would start with scented viola planted directly in the ground, and any bulb would need to be planted in the ground, and not pots, for the bulbs and roots cannot handle freezing and refreezing after warm day thaws. Herbs like bay laurel and rosemary should winter-over nicely, if your house is big enough. Sorry for the ramble!

Thanks! 02568,
The Calamondin is not that old. I bought it at Logee's about 2 years ago, I think, but it was one of their larger-sized plants in a 4"pot then. This would be it's third winter, but it put a lot of growth on last summer, and this is the first time it has produced fruit.