ive not done sunflowers with mine but did get a plate for them end of last yr I have broadcast them in the past with great results
I use my 71 planter mainly for corn and soybeans but does have the capability to plant many other, peanuts and sugarbeets require
adapter plates. seen them many times on ebat y for sale and sunflowers require a spacer plate. plates can still be purchased by a company
in illinoise that will make them 15bucks each. but if this is for wildlife they don't care if its in rows I think a planter like the Brillion would work
out for you one of the few that says will plant corn. but in reality have planted just about everything at one time or anther by broad casting,
just depends on what your planting have broad casted and tilled in corn and soybeans works well, for seed like sorghum broad cast and litely
drag in works like a charm mainly depends on how large and area you plan on maintaining. but most smaller seed will require a cultipacker.
as a rule of thumb the larger the seed the deeper the seed to be planted. most plots an acre or under can easily be broadcast earthway makes good broad cast spreader or solo