Strange some of you had imbe trees with shallow or wimpy root systems. All my imbes had extremely long tap roots when I took them out of pots to plant in the ground. The tap roots are at least twice as long as the top is tall. So a 2 foot tall imbe has a 4 foot tap root. I dug extra deep holes to plant them, yet I still had to coil the tap roots to make them fit in the holes. They don't however have very many fibrous roots.
My two biggest imbes are 10ft tall, but still no flowers. They've been in the ground for 3 years and are probably 5 or 6 years old.
Some useful info from my experience is that they:
*survived 25F low with a few 5 gallon buckets of water next to them. Only leaves and small twigs damage.
*can withstand full day summer Phoenix sun and heat, which is impressive.
*grow well in the 8+pH clay soil and hard water here
*have some iron or zinc deficiency like citrus does here.
I know some people have grafted Luc's Mexican and achachairu to imbe. Did it work and did it grow long term? Please share your knowledge!