Answer: I would try Four Winds Growers, Box 3538, Mission San Jose District, Fremont, CA 94539, ph# 510-656-2591. They sell dwarf citrus, including several varieties of grapefruit. They may be able to give you some tips on grafting too. It's likely that dwarf trees will come into production sooner than the seedling trees you are growing--so you are on the right track with grafting.
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