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Germination of

Helianthus sp.

Russian Mammoth Sunflower: Giant sunflower, Tall sunflower

Helianthus sp.

Helianthus sp. (Sunflowers) can be grown from seeds that are sown directly into the ground or started indoors. If starting indoors, the seeds should be sown in a well-draining soil mixture and kept consistently moist. They should be covered with a light layer of soil and kept in a warm, bright area, ideally with temperatures around 70-75�F. Once the seedlings have developed two true leaves, they can be transplanted into individual pots and placed in a location that receives full sunlight. If sowing directly into the ground, the seeds should be planted in well-draining soil and kept consistently moist until germination occurs.

Some of plants may have very have specific germination requirements that may not be covered in these general instructions. 

Many seeds require pre-treatment before sowing which we try to list here when we can, but this information may not be present here.  Germination times and germination temperatures are to be a guide only.  Many factors can DRASTICALLY affect this.


It's always a good idea to research the specific germination requirements from multiple sources for each plant before attempting to grow them from seed.

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