Prepare to plant your asters in early to mid spring and fertilize the soil prior to planting.
Plant them in a spot with partial to full sun. If you live in a tropical or subtropical area, plant asters in the shade to avoid the hot summer mid-day sun.
Plant your aster flowers in well drained, moist, and humus rich soil.
You can certainly grow aster flowers from seeds, but it is rather tricky as they don't always germinate. You can start the seeds indoors in the winter and keep them in the refrigerator for 4-6 weeks. After 4-6 weeks, move the seeds to a sunny spot. Place the seeds about 1 inch deep.
It's best to plant young asters in mid to late spring. Full grown asters that are already potted can be planted as soon as they become available at your nearest nursery.
Space your aster flowers 1-3 feet apart.
After planting, give your flower lots of water and add mulch to keep the roots cool, retain moisture, and prevent weeds.