Giant Mammoth" grows 2.5 - 3 meters tall with flower heads 25-40cm wide. In a garden, plant them on the north side where they won't cast shadows over shorter crops that need full sun. Plant "Mammoth" seeds early, as soon as frost danger is past to give them plenty of growing time to reach their largest size. Direct sow rather than starting them early in pots -- sunflowers send down long tap roots early in life. Plant five to six seeds together with seed clumps about 6 to 8 inches apart. When seedlings reach 3 to 4 inches tall, thin to the biggest three. At two-week intervals, remove the smallest seedling, leaving just the sturdiest plant of the original clump to grow.


The Coin on the top of the flower is a 20 cent piece to show the massive size!

There is a photo that shows my other sunflowers below to show the height difference ( they’re pollen-less so no cross pollination happening)




Packaging: All our seeds are sent in small zip lock bags to make postage more economical. They have a sticker label with basic germination instructions and are posted in a padded bubble mailer to protect seeds.

Please note for international Purchasers - It is the buyers responsibility to know whether these seeds are allowed into your country as no refunds or re-sends will be given on seeds that do not arrive. By agreeing to purchase these seeds you accept the risk involved in the chance they may be taken by your countries bio-security. My current rate of international non arrivals is about 2% so pretty good considering but i like customers to be fully informed as i cannot know the regulations of every country. Thank you for your understanding. If you would like these seed send via track and tracked parcel this can be arranged but the costs are considerably higher.