Two Trees

You conjure two Large trees within range that must be rooted to a surface that is either horizontal or sloped no further than vertical (no overhangs or ceilings allowed). At surface level, each trunk must be placed in a previously unoccupied 5-foot cube. The two trunks may not be placed in adjacent squares. The space that each trunk occupies does not block movement, but provides cover for a Medium or smaller creature occupying it. 

Attached to each trunk, above it if possible, but spread horizontally otherwise, the caster must place three additional 5-foot cubes of limbs and foliage, providing light obscurement. If space to accommodate the trees is insufficient, the spell fails.

The trunks may be climbed without an Athletics check. The 5-foot cubes consisting of limbs and foliage may be climbed with a DC 10 Athletics check, but will not support a creature larger than Medium.

The spell persists until both trees die or are destroyed or dispelled, or until you cast this spell again. A tree will survive about a month in a typical lightless environment such as a cave or dungeon. When the spell ends, or when a given tree dies, its remains disappear entirely.