I see ads in catalogues for these multiple-variety, and sometimes multiple species trees, I.e.: 5 different pear varieties or cherries on the same trunk. I presume they're grafted, are they hardier or less than a one-variety type? Any more or less prone to frost or insect damage? Short or long lifespan? I live in a zone 5-ish old suburb with houses close together, sandy soil, snow cover and temps depend on whether or not it's an "El Nino" year. How is the fruit production on one of these and how many years do I have to wait?
What about the columnar-type "patio" fruit trees? Anybody have any experience with them? OK, that's probably enough questions for one post, eh? Would welcome input. Thanks.