"branch spread" .... what, exactly, does it mean?
Not exactly sure where to properly post this query; if I'm committing a no-no, please advise where It should be posted.
One well-known producer of fertilizers refers to branch spread as being the "distance from the trunk (of the tree or shrub) to the outermost leaves". They verified this by phone, saying "Yes, branch spread is the measurement from the trunk to the drip line". However, a major competitor describes branch spread on their packaging as the "diameter of the canopy"; the measurement from the outer leaves on one side to the same on the opposite side.
Now, whenever I apply one of these fertilizers, I'll certainly abide by that producer's instructions.. But ... is there any one definition of branch spread that has been adopted by the professional gardening community? (To restate, please let me know if this not the proper forum for this question.)