From a swap with Theresa Carr.
Look to ensure a distance 11.7 inches (30.0 cm) between seeds when sowing - cover at a depth of at least 0.25 inches (0.64 cm) deep if you are going to sow this directly in the garden.
Illumination normally grows to a max height of 1.30 feet (that's 40.0 cm metric) so ensure you have enough space in your garden for this plant.
Remember to water moderately.
Common zinnia 'Illumination' tends to grow best in a soil ph of between 5.5 and 7.0 meaning it does best in acidic to neutral soil.
More information about Zinnia, Illumination Seeds is available in the Folia gardener's wiki. All Zinnia, Illumination Seeds Care Instructions have been kindly provided by our members.