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Dahlias are usually propagated from tubers, but they can also be grown from seeds, either collected yourself or, more likely, purchased new from a garden center, as few floriculturists experiment with seeds. Conversely, some seed companies offer a mix of dahlia seeds (double, semi-double, and single flowers) to create a bright show in your garden.
Growing dahlias from seeds at home should begin early - at least 8 weeks before transplanting into the garden. Considering that the seeds may have low germination rates and sprout sporadically, not all at once, with seedlings appearing over a period of up to two weeks, it is definitely not advisable to delay starting with seedlings until the last moment. It will take about 100-120 days for the seeds to turn into flowers.
The most reliable way to grow dahlias from seeds is to start with paper towels. This often yields better results than direct sowing into seedling trays.
Take two damp paper towels and spread the dahlia seeds on one of them, then cover with another paper towel. Place the paper towels with the seeds in a ziplock plastic bag and place it in the refrigerator where it will stay warm.
Leave the seeds for 3 days. After that time, begin checking the bag daily for signs of sprouting. Once some of the seeds show growth, carefully lay out the entire towel in a seed tray, place it under a grow light, water moderately, prepare small cups with initial soil mix. Over the course of about two weeks, you will be selecting sprouts and planting them. After two weeks, only non-viable seeds will remain on the towel.
A heating mat is not suitable for dahlia seeds. They prefer moderate warmth ranging from 18 to 21 degrees Celsius. Anything above that actually slows the sprouting process.
Keep the seedlings under the grow light, and after the appearance of true leaves, transplant them into larger containers. Dahlia seedlings should be kept indoors until all danger of frost has passed.
For the final transplant, choose a sunny spot with well-draining soil. By spacing the plants 40-50 cm apart, provide them with enough space to form tubers.
Dahlias grown from seeds form small clumps of tubers, which are often too small to divide, so keep the whole clump until next season in a paper bag filled with peat moss or vermiculite, in a cool, frost-free place at a temperature of 4°C to 10°C. These tubers will give rise to plants identical to those grown this year.
