Can cotton hulls be used as mulch on asparagus?
Here is what Stu Campbell’s book, Mulch It! (Storey Books, 2001) says about cottonseed hulls as mulch:
“These hulls can be used most effectively around plants such as beans,
which are suited to wide-row planting. Apply a 1- to 2-inch layer. Or you
can wait until the plants have grown 3 or 4 inches high, then sift the
mulch down through the leaves… Cottonseed hulls have a fertilizer
value similar to, though not as rich as, cottonseed meal. Because they
are so light, the hulls blow around in the wind.
Campbell discusses mulching asparagus with a choice of hay, leaves,
straw, old manure, and compost for winter protection. You can leave these
mulches in the spring, and the tips will emerge through the mulch. If you
wish to extend your growing season, he recommends dividing your bed in 2
parts in spring. Mulch one half heavily with fine material like cocoa
hulls, leaf mold, or ground corncobs. Leave the other half unmulched
until shoots break through the mulched side. Then mulch the unmulched
side. The half which was mulched earlier will bear a few weeks later than
the other half.”
The National Sustainable Agriculture Information Service has a web page on organic growing of asparagus crops which mentions other types of mulch (such as winter rye as a dying mulch and perennial ryegrass and Dutch white clover as living mulches) for this crop, applied at different times.
It sounds to me as if the main drawback with cottonseed hulls is their light weight. Otherwise, they should be acceptable as a spring mulch.