Lisbon Lemon TreeLisbon Lemon Tree Your Slice of Citrus Sunshine If you want a lemon tree thats built to perform in tougher conditions, the Lisbon Lemon Tree is your answer. Widely regarded as the most cold hardy and vigorous of all lemon varieties, Lisbon produces an abundant supply of classic, tart, juicy lemons and keeps producing them nearly year round. Its the lemon tree that doesnt quit. Originally from Portugal and now one of Californias two dominant commercial