He farmed oranges, mandarins, tangelos, portugals (clementines) and grapefruit on his 10-acre estate. A few citrus, including some tangelos and tangerines, are self-incompatible, and require cross pollination. Northern Florida grows significantly fewer tangelos, but they are much sweeter due to climate. Orlando tangelos are available from mid-November to the beginning of February. Tangelos can be used as a substitute for mandarin oranges or sweet oranges. Orlando tangelos are recognized as one of the more cold-tolerant varieties.