Knowledge To Grow – Growing and Using Sunflowers

In my opinion, the happy-face of the plant world is a big, beautiful, yellow sunflower.   They can be grown as a cash crop for their edible seed and oil or for the sunshine they add to a floral arrangement.

Sunflowers (Helianthus annuus) grow rather rapidly producing large, rough leaves and seed laden heads.   The yellow petals that you see around the outside of the head are ray petals, attracting pollinators to the disk and the face of the head actually contains hundreds of disk flowers, each of which will form a seed.  Sunflower heads turn with or track the sun during the early stages of their development.  This aids in light exposure and photosynthesis.  After pollination the disk will remain east-facing and eventually turn downward to protect the seeds from solar radiation.

Seeds may be planted about 1-2 inches deep after the soil has reached a temperature of 50-60 degrees and all danger of frost has passed, through mid-July.  Sunflowers prefer well-drained, sandy loam soil and 6 to 8 hours of direct sunlight.  Depending on the variety, sunflowers mature and develop seeds in 80 to 120 days.  Sow a new row every few weeks to provide continuous blooms until the first frost.

While the shorter varieties will not require staking, it is helpful to provide support for those that grow more than 3 feet tall or are multi-branched.  Plants that are shallow rooted and weighed down with heavy flower heads are vulnerable to summer storms with wind and rain.

I have not had much of a problem with diseases or insects.  Grasshoppers and caterpillars like to feed on the leaves but not so much that it has been detrimental to the plant or yield.  As with everything else in the garden, good crop rotation will prevent problems with sunflowers.

If you are not going to use the seeds, it is fun to watch wildlife enjoy the bounty.  But if you do want to save them, protect the seed from birds by covering the head with burlap or netting.  Sunflower seeds are considered mature when the back of the seed head is yellow.  Remove the entire head and place it in a bag or wrap it in cheesecloth and hang it in a cool, dry, dark area to finish drying.  After about 2 weeks the seed should be ready for eating.   The birds like them raw but I like them roasted with a little salt.  Arrange the dried seeds in a shallow pan and roast them at 300 degrees for 30 to 40 minutes.

There are so many different varieties and colors of sunflowers to choose from.  Start planting today and bring a little sunshine to your life!

As always, Happy Gardening!

More information about gardening and related subjects can be found online. The Purdue University Cooperative Extension Service can be reached at 499-6334 in LaGrange Co., 636-2111 in Noble Co., 925-2562 in DeKalb Co. and 668-1000 in Steuben Co.

Bulb Planting and Care

    by Karen Weiland, Advanced Master Gardener     Fall is the best time to plant hardy, spring blooming bulbs and properly preparing the planting site is a must.  Good soil drainage is important to healthy bulb life so if your soil contains clay, amending it with some compost, peat moss or other organic …

Read More >

Dividing Perennials

  by Karen Weiland, Advanced Master Gardener       One of the maintenance chores of growing perennials is that of dividing them when needed.  There is no set time to do it.  Some may need it every 3 – 5 years, some 8 – 10 years and some would rather not have you touch …

Read More >

October Garden

  by Karen Weiland, Advanced Master Gardener       Some may think that, with the arrival of the cooler weather of fall, garden duties become less.  I find that not so true.  There are still many things to do, including some planting for the next   growing season.  Planting garlic for next years  harvest, sowing …

Read More >

Get your official copy of our

Destination Guide

Request Printed Guide

View E-Guide

Stay informed and sign up for the

EMAIL-Newsletter

Sign Up