Answer: You're wise in carefully planning for the future growth of your trees. They'll reward you with healthy growth and lots of fruit!. Citrus trees need full sunshine and rich, moist, well-draining soil. They'll appreciate some elbow room - good air circulation all around will keep diseases at bay.
Lisbon has an upright growth habit and will eventually reach 20' tall. The canopy will generally remain less than eight feet in diameter. You can prune your tree to keep it shorter and narrower.
A standard Valencia orange tree is globe-shaped, about 20' high and wide. A dwarf Valencia will grow only 12' tall and wide.
To provide adequate space for each tree and to keep them from hanging over the fences into neighboring yards, center your trees in the space you have, giving equal distance between the fences, the house, and each other. Best wishes with your citrus trees!
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