How To Grow Sunflower From Seed?

Sunflowers are a popular choice for gardeners, who love the bright flowers and large seed heads

The plant can grow up to 8 feet tall and the seeds are edible but not very palatable. Growing sunflowers from seed is simple if you follow these steps:

In early spring start the seeds indoors in 4-inch pots.

Start the seeds indoors in 4-inch pots. Soak the seeds overnight, and then plant them 1 inch deep in well-drained potting soil or sterile seed starting mix (available at garden supply stores).

Place the pots on a tray filled with pebbles to ensure that they drain properly. Water them gently but thoroughly.

Cover the seedlings with plastic wrap to keep them warm and moist until they sprout.

Then remove the plastic wrap so it doesn’t trap moisture around the plants’ leaves, which can lead to disease problems later on.

As soon as your sunflower seedlings have two true leaves (the first leaves that develop), move them into larger pots if necessary so they continue growing strong while waiting for spring weather outside.

Provide sunlight.

Sunlight is needed to grow a sunflower plant. How much sunlight? As much as possible, but about 8 hours per day should be sufficient.

Sunflowers need lots of light to produce the most flowers and seeds.

If you’re growing your sunflowers indoors, it’s best to place them somewhere where they’ll get plenty of natural light from a south-facing window or skylight in the kitchen or living room (it’s okay if they soak up some artificial lights too).

If you’re planting your seeds outdoors, make sure that there are no tall trees nearby that will block out direct sunlight for most of the day.

Another thing that may impact how much sunlight gets through is whether or not there is any shade cast by buildings, fences or other structures on either side of your garden plot.

Keep the seedlings moist and warm.

Once the seeds have sprouted and the first true leaves appear, move the pot to a warm, sunny spot.

Keep the soil consistently moist but not soggy.

You can use a watering can with soaker hose attachment or drip system to water your sunflower seeds directly at their base. 

Avoid watering them from above—this may cause mold to form on their leaves and stunt growth.

The best temperature range for sunflowers is between 75°F-85°F (24°C-29°C).

Harden them off for 7-10 days prior to planting.

Harden off your sunflowers for 7-10 days prior to planting them in the garden. 

Harden off is the process of acclimating plants to outdoor conditions before transplanting them outside.

This helps the plants become stronger and more resistant to pests and disease, as well as better able to withstand changes in temperature, humidity and wind.

Harden off sunflowers because they are sensitive to cold weather; you can also use shade cloth over a cardboard box if you have one available until they can stand up on their own.

To harden off your seedlings: Place your potted seedlings outdoors for about an hour each day during the same time every day for seven days (for example: Tuesday through Monday).

If possible place them under an overhang so that they receive some protection from rain or wind chill—but keep in mind that this isn’t foolproof.

Be sure that it’s sunny out when you move them outside during the week, because excess water on their leaves could cause fungal diseases such as damping off or powdery mildew later on down the road when temperatures rise again during summer months.

Transplant sunflower plants when the soil is warm, after the last frost of the season.

Transplant your sunflower seedlings when the soil is warm, after the last frost of the season.

Sunflowers grow best in full sun and need at least 6 hours of sunlight each day to produce a bountiful crop.

Dig holes that are 2 feet apart, place one seedling in each hole and cover with soil. Water regularly until they become established and begin to flower.

Plant them in a location that receives full sun throughout most of the day and has well-draining soil.

Sunflower plants need full sun to grow, so choose a location that receives plenty of direct sunlight.

The soil should also drain well and be fertile. The ideal soil will be moist, but not soggy.

It takes up to 70 days for the plant to bloom, and 100 days until it can be harvested.

Sunflower seeds are ready to harvest when the head has completely dried.

To remove the seeds from the plant, pull off entire heads and place them in paper bags or on wire screens to dry out further. 

You can also store sunflower seeds in an airtight container in a cool, dark location for up to one year.

You can also cook the seeds before eating them. To do so, roast them at 350 degrees F for 20 minutes or until they turn golden brown.


Growing sunflowers from seed is a great way to add color and beauty to your garden.

They are easy to grow and can be planted in pots or directly into your soil.

They make an excellent addition for many different types of flowers, herbs or vegetables.

You should always plant them in full sun areas with well-draining soil so that they can reach their full potential before being harvested.