hot water fin tube baseboard heaters
You can peel or slide some of the fins off the end of the heater pipe and put an elbow there. Add some short pieces of pipe and couplings to get it to fit exactly.
They do make a trim piece that fits over the two ends of the baseboards in the corner although you may have to look around for a piece that fits the make and model you have.
The disadvantages of crab apple trees. In summer, the apples are too sour to pick and eat. In winter the birds come and leave dropping all over the place.