I live in the midwest - zone 5 - and got a few lemons last year from my (new) lemon tree, actually more of a bush. Now it has over a dozen blooms, little to mod. sized green buds. It did beautifully out on my sunny deck over the summer but now that it's cold, it's in my kitchen (large windows - lots of sun). Do I need to keep it at a certain temperature throughout the winter months to preserve the buds so they keep maturing?