I think you want dwarf citrus. These are readily available
wherever the climate is appropriate for citrus outdoors. They
should also be available elsewhere since dwarf citrus can be kept
in containers and moved into shelter during the winter.
I have three dwarf citrus trees in 18" tubs. The Eureka lemon and
Robertson navel orange are about 3' from soil to top; the kumquat
is a bit shorter. They have full-size fruit; but with fewer
branches than full-sized trees, they just don't have as much
fruit. Nevertheless, one year, I got about 60 lemons. I never
got more than about a dozen oranges in a single year. Most years,
I get so many kumquats that I let some just fall and rot.
David E. Ross
Climate: California Mediterranean
Try a general nursery. If you are in a cold-winter climate, you
might have to wait until spring. You might also have to
special-order these. Since citrus is evergreen and cannot be left
out in winter weather, mail-order is risky.
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