I always felt that the suns either shaded out weed growth beneath them or that they had an alleleopathic substance which discouraged other growth. I rarely even fertilize my suns and they grow to 5 feet tall. I plant them 6" by 6" and that shades out weeds.
I think that by the time clover started producing nitrogen (if it survived beneath the suns), it would already have been time to harvest the suns. Just my opinion...plus what I overheard at a conference about putting clover beneath a different crop.
Ann

Did you know (I borrowed this term from Martha) that clover adds carbon to the soil and brings it back into balance? I have heard of fruit farmers planting clover around their trees, and mowing several times during the season. I've never seen clover in the cornfields. I haven't seen anything in the cornfields except corn.

Apparently, my sunflowers did not read that section in the book on weeds regarding an allelopathic effect because we have weeds. For this reason, our sunflower crops are planted in rows and we run the rototiller between the rows at least twice while they are growing. Sunflowers don't do well with the competition from grass/weeds. I'm assuming they wouldn't do well with clover either.

Trish

Most problems between closely-growing crops (weeds are just unwanted crops!) is that they compete for the same nutrients (mostly nitrogen, but also for the more minor nutrients).

Clover works the other way because it is a legume: clover CREATES nitrogen by pulling it out of the air and stashing it in the little nodules in its roots. Plant roots grow and die throughout the season, and the nitrogen in the parts that die can be used by nearby plants.

The clover also reduces water evaporation & helps to shade out weeds.

Sue

Ok....this may be a dumb question but....I'm thinking of planting an all clover lawn this year....do you just go to a farm supply store and they sell clover there or do you get it through the mail? And is there any particular type a person would want? Thanks! Glenn

Thanks for your opinions on the subject. I'm going to get a few lbs. of clover and experiment.

Flowerfarmer- I've never seen clover in a cornfield either. I had read about it recently, but I cannot site the source - I cannot remember where. I just assumed it must be a common practice in areas other than where I live.

Glenn, my local feed mill sells clover in 50 lb. bags. You can also get it online at Johnnyseeds.com or seedsofchange.com. I'm sure there are other places, but these are the ones I am familiar with.

Just my opinion - I would assume you would want a lower growing clover for your lawn - New Zealand White Clover aka White Dutch Clover.

thanks so much for the clover advice....will go to check it out now!

I know this is an older thread but I am thinking of doing this next year. Any update on how this worked out?

I have read that Sunflowers have a good relationship with Mycorrhiza. I am hoping that I an plant these two as green manure next year, then mow them down, let them die over the winter and then plant in a very fungal rich environment in the following spring.