Callery is a care free pear rootstock overall. The trees will get fairly large. White Dutch clover is a good choice yes but it’s very thick. Apples are going to work you pretty hard typically. If I might make a suggestion in a 20’ x25" you might be getting a little tight in there. Let’s say you plant pears 7 feet apart when they are grown you won’t barely have a spot to pick them. That’s a callery pear rootstock in this photo. It’s about 14’ x10’ x 30’ and that’s because I don’t let it get to 20’ around. It produces over 100 pounds of canning pears. That’s a 10 year old tree. I like the idea of using woodchips @disc4tw brought up the best around fruit trees. Callery rootstock don’t care what your soil is like they are aggressive wild pears genetically able to adapt quickly. See that picking pole leaning on that tree is 2 of the 7 feet sections =14 feet tall. The fruit basket is 20.6 x 10.6 x 13.9 inches https://www.amazon.com/POOLWHALE-Liter-Collapsible-Storage-Container/dp/B075M3NF52/ref=asc_df_B075M3NF52/?tag=hyprod-20&linkCode=df0&hvadid=309811990469&hvpos=&hvnetw=g&hvrand=17173274026605185523&hvpone=&hvptwo=&hvqmt=&hvdev=m&hvdvcmdl=&hvlocint=&hvlocphy=9015457&hvtargid=pla-568579132973&psc=1
They are not the best fruit basket by the way. They are collapsible so very easy to store but the problem is they are collapsible so the pears can push out if you do more than just use them to pick and load theminthe truck. They are not intended for carrying they willstart splitting apart since they just snap together.
