It is difficult to generalize about hydrangeas since there are so many varieties. However most prefer a very bright shade with perhaps a little morning sun but not for too long.
Go to the following web site which will allow you to search for Monrovia plants by name, and type in "hydrangea". You'll get a listing of varieties which you can select from for more info and in some cases a photo. Included in the info is a hardiness zone number so you can see if it is hardy to your area (which is zone 5).
When you click on a particular variety name you'll be able to see its landscape size and thus determine its adaptability to the space you haver around that crabapple tree.
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