FAQs: Clearfield Sunflowers

Clearfield Sunflowers are a hybrid sunflower that allows improved chemical control post-seeding. They allow game managers to use both common pre-emergent herbicides, as well as Beyond herbicide following seeding. The seeds produced from this plant are filled with protein and are widely available for gamebirds, songbirds, and small game. Here are a few frequently asked questions we receive about the popular crop:

What’s the ideal seeding depth for Clearfield Sunflowers? 1”-11/2” deep is optimum for sunflowers

Are these Sunflowers Roundup Ready/ Glyphosate Tolerant? These Sunflowers are not Roundup Ready, however you may use Poast (Sethoxydim) and Beyond (Imazamox) as  post emergent chemical options. Glyphosate may be used as a pre-emergent chemical option, but not a post.

Why are there different seed sizes? After harvest, the seeds are sorted by size. This helps when it comes time to plant because all the seeds are a consistent size. Size 3 and 4 are the most popular with row planters.

What size of heads do Clearfield’s produce? The average head size of Clearfield’s is 7-10 inches

What is the seeding rate of Clearfield Sunflowers? 20,000-25,000 seeds/acre

How many acres can you seed with one 25lb bag? Seeding at a rate of 20,000 seeds/acre you are able to plant approximately 10 acres.

Should I use fertilizer? Depending on the previous crop, we recommend applying 60-80lbs/acre of Nitrogen.


  1. I will be using a drill this year instead of a corn planter to plant sunflowers. Any suggestions on how not to plant them too thick?

    1. Hi Eddie thanks for reaching out.
      One suggestion would be to plug every other spout or opening in the drill box so you will be getting 15″ spacing. This will allow the sunflowers some more room and you will not stunt the growth.

      For sunflowers going through a planter I would stick with a large seed size. 2 and 3 seeds are the larger sizes and they are what everybody prefers for planting with a planter or drill. I won’t have specific instructions on how to calibrate specific types of planters.

      You will want to find a manual and look for 20,000-25,000 planting population for sunflowers. The manual should at least get us a ballpark setting for you to make adjustments.

      Another easy way to check is on some hard gravel or concrete area you can drive the planter ahead (not on the ground) and should have 5-6” between the seeds for a very general indication you are not getting seeds planted to thick.

      So in short get a size 2 sunflower, and then you will have to get some homework or educated guessing on getting the seeds spaced 5-6inches apart.


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