Oh, it was no problem at all - and thank you for the 10 TBT. I really appreciate it

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It indeed is really annoying though ><. I had the same troubles with my town (I was bordering my width-2 paths with bushes too) and it frustrated me how some would die. I was able to find a small work-around in some instances though. Sometimes it looks okay if you replace a spot intended for two bushes placed vertically with one tree placed on the lower spot. That way - the number of bushes/trees is reduced by 1 and when the tree is fully grown it kind of covers up the opening xD.
Also, I should mention that the 7x7 - 15 bush/tree rule has never failed for me in my town... however there may be some exceptions and/or stricter rules based on how the game naturally divides the town up into invisible acres but I haven't found anything to confirm or deny this. I wish you luck with planting though and hopefully you can find a solution =)!