The best time to plant Dahlias is late September or October. Dahlias love sun so choose a nice sunny spot in your garden. Ideally a spot that gets at least 4 hours of full sun a day. Dahlias will grow in almost any soil, but prefer well drained loamy soil conditions. Prepare the ground a few weeks before planting by digging over the soil thoroughly and adding a little well rotted compost and an application of general fertiliser. Before planting the tubers, apply stakes (for larger varieties) staking after planting damages roots and tubers. Plant your Dahlia tubers about 5-10cm deep and about 50cm apart with the eye facing upwards. Water well and keep moist being careful not to over-water. Pinch out the tops of dahlia plants after the second set of leaves has developed. This makes the plant branch to form four flower stalks instead of one.