[Disclaimer: I am not a Rambutan expert. This is all just Opinion and NOT-ADVICE.]
The soil in my (Zone 10) South Florida location is too acidic for Rambutan. This is what I’ve been able to gather after doing some research on this very helpful, Best of the Best, Forum. Question: Is there a way(s) to go around this?
These could be among the Best Course of Action Strategies, in order to have a fruit producing Rambutan Fruit Tree in South Florida:
Strategy #1
Dig a Wide and Deep Hole; the wider & the deeper, the better (Is 5 feet Wide By 5 ft. Deep, or 10’ Wide X 10’ Deep, too much?). Then, fill it with good quality Potting Soil. Finally, plant the fruit-producing Rambutan fruit tree; The Source of the fruit producing Rambutan tree can be from Potted Seedlings, or a Grafted Fruit-Producing Rambutan tree that you bought from someone.
The ‘Con’ of this Strategy is: (A) You’ve got to have the Space, (B) The Effort & Time to dig the Hole, and (C) The $Money to purchase the quality Potting-Soil to fill the Big-Hole with.
Strategy #2
Can a fruit producing potted Rambutan be grafted onto another species (i.e. Lychee, Longan, Spanish-Lime...) and still thrive & fruit in the Acidic South Florida Soil? Perhaps someone who’s done this can provide the detailed information on how it went, or is going.
Strategy #3
Use Genetic Engineering Technology like CRISPR, so that the result is a Rambutan Variety that will thrive and fruit in the Acidic Soil of South Florida, just as its other Cousin-Species do, such as Lychee, Longan, Spanish-Lime...
P.S.
Rambutan is a fruit that I want to get to know (in detail and scientifically-in-depth) more about; just as I’ve regularly seen ‘Experts’ routinely go about doing so in this Forum. This is because I find the taste of chilled Rambutan to be just great, and it’s even easy & fun to eat; although the other King of the Fruits, the Lychee, still wins.