Ask a Question forum→Sunflowers hulls as an organic grass killer

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Name: Denise Mennitt
Rutherfordton, North Carolina (Zone 7a)
Mar 11, 2019 10:59 AM CST
Couldn't sunflower hulls be used as a organic source for killing grass around fences? Rutherforton, North Carolina.
Name: Philip Becker
Fresno California (Zone 8a)
Mar 12, 2019 9:28 AM CST
Sure Denise.
You have access to like ?🤔??? Yards of seeds hulls.
A couple inches would act like a mulch, inhibiting weeds from sprouting. The salt from hulls would inhibit weed seeds from sprouting.
It goes unsaid, that you wouldn't want to use them around growing plants. 😌😟😭
Philip 😎😎😎
Anything i say, could be misrepresented, or wrong.
Name: Rick R.
Minneapolis, MN, USA zone 4
I was one of the first 300 contributors to the plant database! Garden Sages The WITWIT Badge Garden Photography Region: Minnesota Hybridizer
Seed Starter Plant Identifier Million Pollinator Garden Challenge
Mar 13, 2019 6:27 AM CST
But they won't kill grass that is already there growing. The established grass will easily find its way through even 6 inches of hulls. But if they are hulls from salted nuts, the salt might kill them. I'm not sure how much of a concentration of salt you would need, but table salt wouldn't be good for any plant.

- Remember from your school history class, how the Romans poisoned the fields at Carthage with salt, so they conquer over that city-state?
When the debate is lost, slander becomes the tool of the losers. - Socrates
Name: Sally
central Maryland
Seriously addicted to kettle chips.
Charter ATP Member Houseplants Keeper of Poultry Vegetable Grower Region: Maryland Composter
Native Plants and Wildflowers Organic Gardener Region: United States of America Cat Lover Birds Butterflies
Mar 13, 2019 4:29 PM CST
Sunflower hulls have a reputation of having a chemical that kills plants or stops seed sprouting or something. I am not sure how true it is or how much has been seen to be effective.
i'm pretty OK today, how are you? ;^)
Name: Dr. Demento Jr.
Minnesota (Zone 3b)
Mar 13, 2019 4:34 PM CST
Sunflower is an annual dicotyledonous plant, herbaceous, erect and native of North America. It is thermo- and photo-insensitive, hence, can be grown round the year in sub-tropical and tropical countries. Only two spp. H. annuus and H. tuberosum are cultivated for food, remaining spp. are ornamentals, weeds and wild plants. However, H. annuus is allelopathic and inhibit the growth and development of other plants thus reducing their productivity. Much information is available about the allelopathic effects of sunflower crop on following crops in crop rotations. Although it is harmful to all crops, but, is less harmful to crops of Graminae family than other families. It seems that the harmful effects of sunflower in crop rotations are due to release and accumulation of root exudates during crop growth in soil. Soil incorporation of its fresh (green manure) or dry biomass in soil is inhibitory to both crops and weed spp. Several allelochemicals have been characterized from the H. annuus, which inhibit the seed germination and seedling growth of A. albus, A. viridis, Agropyron repens (Elymus repens), Ambrosia artemsiifolia, Avena fatua, Celosia crustata, Chenopodium album, Chloris barbara, Cynodon dactylon, D. sanguinalis, Dactyloctenium ageyptium, Digitaria ciliaris, Echinochloa crus-galli, Flaveria australasica, Parthenium hysterophorus, Portulaca oleracea, Sida spinosa, Trianthema portulacastrum, Veronica perisca. The inhibitory effects of this crop may be used for weed management with less herbicides for sustainable agriculture.
Name: Denise Mennitt
Rutherfordton, North Carolina (Zone 7a)
Mar 13, 2019 6:24 PM CST
Thanks everyone for the input! I am going to experiment with it. My yard is a bird and bee sanctuary and I won't use chemicals. I'd just let the grass grow but I've got to be a good neighbor !

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