Just a reminder to those who dont know this rootstock the thorns are wicked! They are a fantastic rootstock.
Any idea what is the natural proliferation rate of BET vs Callery?
Callery outgrows BET at first and ohxf outgrows both for the first year. In my area everything out grows harbin. Ohxf97 grows 30% faster than ohxf333 by the 2nd year. Ohxf87 is similar growth to ohxf97 but slightly behind it by maybe 10%. Callery overtakes ohxf by the 3rd year and outgrows it sometimes by double by the fifth year. BET will be at least 30 -50% ahead of BET by the 5th year. In good soil a BET hits 18 feet by the 5th - 7th year and Callery will be at 12 - 15 feet depending on variety. There are hybrids of both! Many bartlett seedling rootstocks are fantastic well behaved rootstocks but the rabbits , deer , and fireblight for starters are all problems with them. Ohxf333 does not have much steam which makes it a fantastic dwarf in heavy clay. It still grows big if you let it but very slowly after 5 years. That delayed growth is concerning long term. It will likely run out of steam very early on and BET will be around in 100 years with plenty of vigor.
I meant more of the self-planting rate, but your post was very interesting nonetheless.
I have definitely seen Callery trees compete with grass and grow so well without any babying. I see Callery all over the place, especially in ditches. I also have OHxF that nearly died (maybe deer pressure) but it is rebounding. BET definitely out grows OHxF (even when OHxF had another year in ground). After 3 OHxF died, I only planted BET, and am experimenting with grafting on seeding Calleries.
BET does not self seed here i dont let it. Im afraid of a field full of those thorny trees. Had one bloom this year!
I’m wondering BET would be competitive to Callery. Both have tiny fruit that I assume same bird species could disperse. Perhaps we only hear of invasiveness of Calleries because of it’s ubiquity in ornamental landscaping. Perhaps BET could be invasive as well.