Best Way To Grow Dahlias In Pots. Even you can grow these plants indoors with the help of a grow light or a sunny window. Use a large pot about 12 to 14.
1 Start Your Dahlias Indoors For an Earlier Bloom Time. Always buy soil that is labeled for use in potted plants for the best growth. Fertilizing during the potting stage is therefore futile as the plant wont absorb nutrients from the soil yet.
The best way to grow dahlias is to start them in pots.
Dahlias are not fussy when it comes to soil. For best results grow in any fertile moist but well-drained soil. Anytime between early April and all the way until June is a great idea especially if you are in the Northern Hemisphere. Stretch this horizontally across the posts beginning at around 25 30 cm and gradually raise the height as the plants grow.