I live in the Denver area and have some areas of the yard that I'm
replacing with shredded tree mulch. We have a tree company that shreds
trees and is nearby, and once in awhile we can get them to drop off a
truck load of mulch.
What I'm wondering is: Even though grass wont grow up from under the mulch
( it's 4" or so deep ) will bulbs come up from under that if I plant them
Large flowering bulbs will come up thru 4 inches of mulch (e.g. daffs,
tulips) and multiply and return year after year. Small flowering bulbs
(e.g. crocus) will flower, but will struggle to come back year after
year. They will not have enough leaf area above the mulch to gather the
energy to multiply and grow back strongly.
Tulips, Daff's will come up as will many other plants.... I've mulched
2 - 4" around trees and beds back in March.... the hostas, plantains,
roses, daff, tulips, peopies are all coming up.
4" is enough mulch to keep a lot of (desireable) seeds from sprouting.
Not sure about ferns.
recommend taking mulch from tree removal companies and power line clearing
crews just because it's free. They grind material from over a broad range
which vastly increases the odds of acquiring a plethera of serious diseases
and insect infestations (I learned the hard way). The bagged pine bark
nuggets I buy is sterilized, is available in various sized pieces, is
inexpensive, is attractive, and lasts a long time.
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