Less vigorous root system, but that's how it dwarfs the plant -- not sure if they're less resistant to disease (I expect this is one of things they select for w

Less vigorous root system, but that's how it dwarfs the plant -- not sure if they're less resistant to disease (I expect this is one of things they select for while breeding). Definitely these types (m9 ,m27) and similar need staking the entire life of the plant. Cocktail tree is something I've only heard in Australia, and only from some small subset of nurseries -- it's also commonly used in Spain then? A cocktail plant for me would normally be something like Mentha nemorosa (also challenging to find in Australia). A friend had a 3-way citrus, which did breathtakingly poorly for them, for the same reason my two (3-way pear, and a 3-way apple) -- a single dominant variety and two much less vigorous grafts. My two are now at least 25 years old, and still present more maintenance challenges than some decent stakes, soil maintenance & mulching.