Mammoth Sunflowers are...mammoth. This variety reaches over 10' tall with heads that span 12". Super easy to grow and great for kids who want to live in their own version of Honey I Shrunk The Kids. You can even roast the seeds for a nutritious snack.
Start indoors, then transplant outdoors into your garden or a container. This Mammoth Sunflower seed starting kit is packaged in a nutrient-rich, biodegradable CowPot that helps heal soil and support healthy plant growth.
Certified Organic Mammoth Sunflower Seeds
Coconut Husk Growing Medium
Composted Cow Manure CowPot
5.25”l x 5.25”w x 5”h
Made in the USA
When should I start this kit?
Mammoth Sunflower can be started up to 3 weeks before the last frost date. Sprouts appear in 10-20 days.
When can I harvest my plant?
Blooms in 100-110 days. The 10’ plants produce flower heads that average 12” across.
How much sun will it need?
Mammoth Sunflower prefers full sunlight.
How do I transplant?
Once your plant is established, you will need to fertilize it. Visit your local garden center for a healthy selection of organic nutrient offerings. Transplant once seedlings have 2-3 sets of true leaves and outside night temps stay above 55°F. You may need to repot indoors before the outdoors is ready. CowPots start to break down after 12 weeks. Before transplanting thin your seedlings with scissors by snipping out any weak or crowded stems. Leave 2-3 plants. Then harden off your plants by placing them in a protected area outside for a few hours each day for one week. Plant in location with full sunlight. Prep your transplanting location either container or ground—by digging a hole large enough to accommodate the CowPot. Mix ½ gallon of a mild water and nutrient solution (¼ strength, follow nutrient’s instructions). Pour solution in hole, reserving ½ cup of solution. Pour remaining nutrient solution into CowPot. Bury the CowPot completely and fill in hole with soil. Tamp the soil lightly with your hands and water the entire area to help the plant settle.