Helianthus, Sunflower, Heirloom Mammoth Greystripe ~ 48 seeds

Sun Preference
Full-Sun
Bloom or Harvest Time
Summer, Fall
  $4.49

Description

Helianthus annuus
Annual
Summer/fall bloom
Frost tender

A butterfly, bee, & hummingbird favorite!

These tall, pollinator-friendly golden sunflowers are followed by heavy heads of plump seed kernels that make tasty and nutritious eating for fun snacks. Or feed seeds to birds! 

Seed Starting Successfully

Start your garden from scratch with Gertens' wide variety of seed packets! Whether you're a seasoned gardener or just starting out, we have seeds for every skill level and garden size. From colorful flowers to delicious vegetables, our seeds are carefully selected for their quality and performance.

Seed Starting Successfully

Grow Your Best

When to Grow Veggies & Fruits

From Our Experts

Details

Plant In: April – June
Sun/Shade: Full sun 
Planting Depth: 1 inch 
Space Seeds: 6 inches apart
Days To Germinate: 8 – 10 days 
Mature Height: 12 – 13 feet 

EASIEST TO START DIRECTLY IN THE GARDEN
Plant in full sun in good garden soil when all danger of frost is past and temperatures have reached at least 50°F (10°C) both day and night. Poke seeds into well-worked soil 1 inch deep and 6 inches apart. Press soil firmly over seeds and keep moist as seedlings emerge.

THIN OR TRANSPLANT
When seedlings are about 3 inches tall, thin to 12 to 18 inches apart with 2 feet between rows to give growing plants room to establish strong roots and sturdy stalks that won’t blow over.

GROWING NOTES
Keep soil moist and well weeded and protect seedlings from birds at planting time with netting or plastic berry baskets, removing before plants get crowded. For large heads, space seedlings at least 12 inches apart so plants can grow to full size.

HARVEST AND USE
As sunflowers bloom, bees pollinate the florets in each head and seeds begin to mature. When center disk florets have dried up, cover the ripening seed heads loosely with paper bags if you don’t want birds to eat the seeds. When ripened kernels are plump and hard-shelled, cut entire heads, dry fully, then remove the seeds by hand. Store in closed containers to eat for snacks or feed to the birds over the winter. 

More Information

Mature Height (Range) 73" +
Spacing in Row 6" thin/transplant 12-18"
Days to Germination 8-10 days
Planting Depth 1"
Seed Packet Type Organic Vegetables
Plant Life Cycle Annual
Bloom or Harvest Time Summer, Fall
Sun Preference Full-Sun
Common Family Name Sunflower
Brand Renee's Garden

Product Questions (12)

Starting times will vary depending on the vegetable you are growing. Each seed packet will have specific sowing instructions for that type of vegetable. Some plants, such as tomatoes and peppers, should be started indoors, 6-8 weeks before the last frost...
The process of bringing seeds outside is called hardening off. Hardening off is generally done sometime after the seedling has two full sets of normal leaves. In Minnesota, you want to begin hardening off seedlings in late April/early May.  To ...
If you have a southern facing window with all day sun, you may grow seedlings in a windowsill. Be sure to rotate the seedlings frequently to ensure the plants do not lean heavily towards the sun. For more even results, use a grow light, positioned roughly...
We recommend using either high intensity T5 fluorescent bulbs, or LED grow lights. Both setups will produce excellent results. T5s are the typical grow light, are economical and come in frequencies that are helpful for plant development. LED technology...
Grow lights should be kept roughly 4-5” above the top of seedling leaves. If you are using very powerful LEDs, you could even keep them 8-10” away.
Grow lights should be used to mimic a natural sunlight cycle for plants. We recommend using them 12 hours a day, from roughly 7am to 7pm.  
A variety of seedling trays exist for seed starting. If you are starting smaller seeds, a simple peat cell tray works great. However, the larger the seed, the larger the initial pot should be. If you are starting larger seeds indoors such as: sunflowers...
Do not start any type of fertilizer regime for young seedlings until they have at least two full sets of regular leaves. Start with a root stimulator, then after a month you may move on to a gentle, weak (half strength) water-based fertilizer. Remember...
Let the roots tell you when to transplant. When you begin to see the seedling’s root growing out of the bottom of their current pot, it is time to transplant up to something larger. We recommend using a 4” nursery pot to transplant most seedlings. In...
Gertens carries a wide variety of both spring and autumn planted bulbs. Spring planted bulbs, such as gladioli and dahlias, are best started indoors in early April, and planted outside once the soil temperatures are above 55 F. Autumn planted bulbs, ...
The big three tips are: 1) Staking and training 2) Feeding and watering and 3) Harvesting and enjoying. 1) Keeping plants trained and staked allows air circulation around crops and provides much-needed support for produce as it grows...
Gertens does carry an assortment of both perennials, as well as annual and perennial wildflower mixes. It is important to remember when growing perennials, that you will not get any flowers the first year of growth. It often takes a perennial 2-3 years...
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