Answer: mosses

AnswerCrossword Clue
MOSSESThey tend to grow on the north side of trees
MOSSESBryologist's concern.
MOSSESGround greenery.
MOSSESRock garden features.
MOSSES"... from an Old Manse"
MOSSESHawthorne's "... from an Old Manse"
MOSSESFoxfeet and sphagnum
MOSSESBryologists' study
MOSSESThey may cover rocks
MOSSESBryophytic growths
MOSSESRock garden plants.
MOSSESBark-covering plants
MOSSESThey grow on trees, sometimes
MOSSESBryologists' studies
MOSSESShaded growths
MOSSESBog growths
MOSSESSome rock coverings
mossesMOSS, to cover with moss
mossessmall, leafy-stemmed plant growing on rocks, moist ground, etc.
MOSSESPeat .. (gardener's purchases)
MOSSESThey're popular in Japanese gardening
MOSSESPeat bog plants
MOSSESPlants in damp, dark areas
MOSSESSome Everglades flora
MOSSESBog plants
MOSSESTree growths
MOSSESFlowerless plants
MOSSESSeedless flora
MOSSESTree-trunk growths
MOSSESTree trunk growths
MOSSESNonflowering plants
MOSSESPlants.
MOSSES"... from an Old Manse."
MOSSESPlants growing in velvety clusters.
MOSSESGarden growths.
MOSSESRelatives of Portulaca, Sedum, etc.
MOSSESVelvety plants.