Which preposition to use with uncurls

in Occurrences 2%

There one finds the European mallow (Malva rotundifolia) spreading out to the streets with the summer overflow, and every spring a dandelion or two, brought in with the blue grass seed, uncurls in the swardy soil.

above Occurrences 1%

Standing here we heard the guns speak apparently from almost beneath our feet, and three or four seconds thereafter we saw five little puffballs of white smoke uncurling above a line of trees across the valley.

Which preposition to use with  uncurls