How to Plant Aster Seeds

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Using aster seeds to grow aster flowers for your home or garden is a very rewarding experience that will result in beautiful, colorful blooms that you can be proud of. Aster flowers can grow in many soil types, and are easy to plant and care for. While growing asters from seed is not difficult, these steps will help you make a success of it.

What You Will Need

  • Aster flower seeds
  • Compost
  • All-purpose fertilizer
  • Animal manure or super phosphate
  • Garden spade

Step 1: Purchase Aster Flower Seeds

Visit your local home improvement store or garden nursery and purchase aster flower seeds for the variety you wish to plant.

Step 2: Prepare the Soil

Before sowing your aster flower seeds, you will need to prepare the soil. Add compost and animal manure to the soil and turn it. If you do not have animal manure available, purchase a quality super phosphate nutrient additive from your local nursery or home improvement store.

Step 3: Sow the Aster Seeds

Sow the seeds for your aster plants as early in the season as possible, but make sure to plant after the last frost. Aster seeds normally germinate in about 10 to 14 days. Make sure not to cover the seeds with too much soil. For the best results, cover your aster flower seeds with 1/8 to 1/4 inch of soil.

Step 4: Add Mulch

Add quality organic mulch around the area where you planted your aster seeds. Make sure to allow about 2 inches of clearance so that the aster plant can break through the soil and not be impeded by the mulch. Using quality organic cedar mulch will also help by acting as a fertilizer as the most decomposes.

Step 5: First Watering

The initial watering of your aster seeds should be thorough, but do not soak the soil too much. Aster plants don't usually do very well in wet soils, and they can withstand dry spells very well. So, make sure the soil is moist but not soaked.

Step 6: Add Fertilizer

Add good-quality, all-purpose fertilizer that is high in phosphate concentration to your aster seeds. You should continue to add fertilizer once a month to your aster plants as they grow.

Step 7: Cut Back the Plants

Aster flowers will usually begin to bloom mid to late summer and continue blooming until late fall or winter. You should occasionally remove dead flower bloom growth to improve the appearance of your aster plants. For large variety aster plants, cut back stalks as needed to maintain appearance and promote new growth. If you live in an area where winters are particularly cold, you might want to consider cutting the aster down to where the stem only protrudes about 2 or 3 inches out of the soil. You can also add additional cedar mulch to help protect the aster and its root system from the cold as well. After the last frost, clear away any mulch so that the aster flower can begin to grow again.

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