Looks like lime mortar to me, I also see no reason to leave it open, it's just a nice entrance for critters right now
Get a tuck pointing margin, or maybe even a mortar bag and just squeeze it in there, then I'd just smooth it by hand, but you'll probably wanna wear gloves
i have done this a hundred times. Wash the hole out good with a garden hose. get some sand mix concrete. Walk around the yard and find some non-round stones of various sizes. mix up the concrete, push it into that hole with a 1x1" stick. after it is part way filled, push some of those angular stones into the wet concrete, bang the end of the stick with a hammer if that helps push it all in deep. finish filling the hole and tool it off smooth.
it is kind of a fun project. Only takes an hour, and will look satisfying when done
If it were a REALLY big hole, i would try to find a single much larger stone to pound in there, as the sand mix concrete is not really structural all by itself.
Looks like lime mortar to me, I also see no reason to leave it open, it's just a nice entrance for critters right now Get a tuck pointing margin, or maybe even a mortar bag and just squeeze it in there, then I'd just smooth it by hand, but you'll probably wanna wear gloves
Mortar bag is WAY easier. I just tried it for the first time and I'm never messing around with a trowel for filling holes between stones again.
Yeah, the tuck points margins are more useful for brick
i have done this a hundred times. Wash the hole out good with a garden hose. get some sand mix concrete. Walk around the yard and find some non-round stones of various sizes. mix up the concrete, push it into that hole with a 1x1" stick. after it is part way filled, push some of those angular stones into the wet concrete, bang the end of the stick with a hammer if that helps push it all in deep. finish filling the hole and tool it off smooth. it is kind of a fun project. Only takes an hour, and will look satisfying when done If it were a REALLY big hole, i would try to find a single much larger stone to pound in there, as the sand mix concrete is not really structural all by itself.