Base board has uneven heat
Is this baseboard on a separate zone from the rest of the house? Is the circulator pump for the zone working properly?
If the baseboard is on the same zone as other radiators and there are several branch loops all in the same zone, are there individual valves down in the basement for each loop? Try adjusting these.
Add some water to the heating system to make sure that there is some pressure inside.
Use a level to verify that the end of the baseboard with the valve is not lower than the other end. If necessary slowly and gently jack that end with the valve up an inch or two (Do not use force). Turn on the furnace or zone and let it run for at least half an hour. Then try to bleed the valve.
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.