Growing sunflowers in Wisconsin is a great way to add color and beauty to your garden. Sunflowers are easy to grow and provide a cheerful and vibrant addition to any outdoor space. Sunflowers are long-lasting, require little maintenance, and are perfect for any garden size. They grow best in full sun and bloom from early summer to early fall, making them an excellent choice for Wisconsin gardeners.
Sunflowers are hardy flower that is able to withstand the cold Wisconsin winters and provide beautiful blooms during the warmer months. They can be planted in a variety of soils, and the sunny yellow petals brighten up any garden. Growing sunflowers in Wisconsin is a great way to add beauty and color to any outdoor space.
Wisconsin climate and growing zones
In zone 3, the coldest winter temperatures are between -30 and -40 degrees Fahrenheit. Summers here are usually mild and the growing season is about 120 days long. The area is typically snow-covered from mid-November to mid-April. Plant species that thrive in this zone include junipers, pines, spruces, flowering crabapples, and other cold-hardy trees and shrubs.
Zone 4 is milder than zone 3 and experiences cold winter temperatures between -20 and -30 degrees Fahrenheit. Summers here are warm, and the growing season is about 150 days long. Trees and shrubs such as American hornbeam, American holly, and witch hazel are well-suited to this zone.
Finally, zone 5 has cold winter temperatures between -10 and -20 degrees Fahrenheit. Summers here are hot and humid, and the growing season is around 180 days. Trees and shrubs such as dogwoods, red oaks, and redbuds are well-suited to this zone.
Growing sunflowers in Wisconsin
For those wanting to grow sunflowers in Wisconsin, the best time to do so is during the summer months. The warm weather and ample sunshine provide ideal conditions for a successful crop. Sunflowers are typically planted in the early spring, usually around March or April. It is important to choose varieties that are cold-tolerant, as temperatures can drop below freezing during the winter months.
Sunflowers require a lot of sunlight, so it is important to choose a spot that receives full sun throughout the day. It is also important to ensure that the soil is well-draining and has a neutral pH. Sunflowers prefer a soil pH of 6.5-7.5.
Water is essential for any successful sunflower crop, and Wisconsin’s climate can be unpredictable. During the summer months, it is important to keep the soil moist but not soggy. During the winter months, the soil should be allowed to dry out slightly between waterings.
It is also important to consider the potential pests and diseases in the area. Common pests that may affect sunflowers in Wisconsin include aphids, Japanese beetles, and earwigs. Common diseases include rust, powdery mildew, and downy mildew.
Some of my favorite varieties of sunflower include:
- Mammoth Grey Stripe Sunflower (Helianthus annuus) – 75-100 days to maturity
- Teddy Bear Sunflower (Helianthus annuus) – 60-90 days to maturity
- Red Sun (Helianthus annuus) – 65-95 days to maturity
- Autumn Beauty Sunflower (Helianthus annuus) – 75-90 days to maturity
- Lemon Queen Sunflower (Helianthus annuus) – 75-95 days to maturity
- Velvet Queen Sunflower (Helianthus annuus) – 90-110 days to maturity
- Dwarf Sunspot Sunflower (Helianthus annuus) – 60-90 days to maturity
- Giant Sungold Sunflower (Helianthus annuus) – 85-110 days to maturity
- Evening Sun Sunflower (Helianthus annuus) – 75-95 days to maturity
- Sundance Kid Sunflower (Helianthus annuus) – 75-95 days to maturity
When to start sunflowers indoors in Wisconsin
Sunflower seeds should be started indoors 4 weeks before your final frost date. In Wisconsin, the final frost dates are:
- Zone 3: Around May 15th
- Zone 4: Around May 12th
- Zone 5: Around April 30th
You should also consider the size of the variety of sunflower you are planting, as shorter varieties can be planted later and taller varieties will need to be started a week or two earlier. Sunflowers should be started indoors:
- Zone 3: Around April 17th
- Zone 4: Around April 14th
- Zone 5: Around April 1st
Starting sunflowers from seed is a relatively easy process that can be done both indoors and outdoors. To begin, you will need to purchase sunflower seeds from a garden center or online. When selecting seeds, make sure to look for the desired variety you want to grow. Once you have your seeds, you can choose to start them indoors 4 weeks before the last frost date for your region.
Fill a seed tray with starter soil and moisten it with a spray bottle. Place your seeds on top of the soil, cover them lightly with starter soil, and water them gently. Place the tray in a warm and sunny spot, and keep the soil moist. Once your plants have grown 2-3 sets of leaves, you can transplant them outdoors.
Planting sunflowers outside in Wisconsin
Sunflower seeds should be planted outdoors after the last average frost date for your area. Planting sunflower seeds too early can result in poor germination and seedling growth and potentially death if there’s a hard freeze.
When planting outdoors, make sure the area has plenty of sunshine and well-draining soil. Dig a hole that is twice the size of the root ball, and fill the hole with compost or aged manure. Place the seedling in the hole and backfill with soil, then water deeply.
For the remainder of the sunflower’s life, make sure to keep the soil moist and fertilize regularly. With proper care, you should have beautiful sunflowers in no time!
When to harvest sunflower seeds in Wisconsin
When sunflower seeds are ready to be harvested, the back of the flower head will be dry and start to turn brown. The individual seeds will be dry and firm. The green husks surrounding the seeds will have turned yellow or white and begun to dry out. To check if the seeds are ready to be harvested, lightly pinch the seed head between your thumb and forefinger. If the husks break open easily, the seeds are ready to harvest.
Harvesting sunflower seeds is easy. Cut the flower head off the stem and spread it out on a clean surface. To remove the seeds, use your hands to rub the flower head and release the seeds. Collect the seeds in a large bowl or container. Once the seeds are harvested, store them in an airtight container in a cool, dry place. Make sure the container is well sealed to keep the seeds from going bad. Sunflower seeds can last for up to a year if stored properly.
Sunflower seeds are delicious and nutritious snack food. They can be eaten raw, toasted, or sprouted. Sunflower seeds are also used in salads, cereals, granola, and energy bars. They are loaded with essential vitamins and minerals like Vitamin E, phosphorus, magnesium, and zinc. Sunflower seeds can also be used to make sunflower seed butter, which is a great alternative to peanut butter.
In addition to being a healthy snack, sunflower seeds are also used to make birdseed. You can leave your sunflowers intact outside well after the flowers have died to give your local birds a tasty snack!