Want to plant a tree in Baltimore? It could cost you.

The Baltimore Department of Transportation has changed how it charges fees for some work permits used by tree-planting organizations in the city. The change comes about three months after the nonprofit Baltimore Tree Trust said it was suddenly charged permit fees it had not previously been charged. The fees, according to the group, could have been as high as $12,000 for a $22,620 project in Midtown and $10,680 on a $25,577 project in Greenmount West.