NjoyNit,
Those are pretty expensive
plants.
Standard or dwarf lemons usually bear fruits several times a year. While the dwarfs grows to about 8 ft. the standard
tree can reach over 20 ft. and should be cut back regularly to keep them compact and fruits within easy reach (similar to what Nicholas did to his orange
tree).
The shoots that grows from the base of your lemon
tree are called
suckers. Sucker growth comes from the rootstock of a grafted or budded
plant. I usually remove the suckers (by grabbing the base, pushing it down 90 degrees and pulling it out; the suckers will grow back if removed by cutting (with a pruner or any other cutting tool).
Lemons are best grown in California, Arizona, Texas, the gulf coast and Florida. Some of the lemon varieties are: Eureka, Improved Meyer, Lisbon and Ponderosa.
Your lemon
tree is a Ponderosa. You are right, the fruits are grapefruit-sized, juicy, acidic, the rinds are thick, thorny and has large leaves.
My guess is, you won't see any fruits from the grown suckers for at least 7 to 8 years and with questionable quality. A grafted or budded lemon
tree will bear fruits in 3 to 4 years.
A good lime
tree for your area? Most common varieties are Bearss (tahiti and persian), Mexican (key) and Rangpur. Either Bearss or Mexican (Mexican lime is also known as the Bar Tender's lime) would be good.