huntersgirl---I can't confirm if it is a horsechestnut or not.We had one,in front,but the State reconfigured the road(Rt125)& cut it
down.There is something,that is recommended,for trees,with a
split in the bark.I think that it concerns painting, the wood, with
something,so that it doesn't get infected with pests.If you want to
save it(the tree)then I would suggest checking with a tree surgeon or website,etc.Suggestion:Try a search site. Irish

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Irish---Better to be dead & cool,then alive & uncool!
(Harley Davidson & the Marlboro Man)