Fertilizing Asters

Asters would appreciate a light coating of compost in spring or, alternatively, a balanced flower fertilizer twice a month beginning in spring and continuing until the flowers begin to open. Although asters may appreciate the additional application of compost and fertilizer, it may not be necessary if they are grown in fertile, well-drained garden soil. Asters do well in a wide variety of soil types. Newly planted asters typically require no supplemental feeding as they come from the nursery with plenty of nutrients in their pots for the first year. 

How to Fertilize Asters

A well balanced, granular fertilizer such as a 5-10-5 or 10-10-10 is best and should be applied according to the manufacturer's directions around the base of the plant and well watered in. Avoid applying any type of fertilizer when temperatures may go above 80 degrees for any length of time as this may burn the plants roots and leaves.

Best Time To Fertilize Asters

It is best to fertilize in cooler weather and preferably before it rains.

Best Fertilizer For Asters

Granular or time-released fertilizers are better than liquid types and are less likely to burn the plant. Liquid Miracle Gro can cause a build-up of salts in the soil and damage the plant's roots, so use it at half strength sparingly.

Aster Fertilizing Tips

  • Use a granular fertilizer twice a month beginning in spring and stop when flower buds appear.
  • Scatter fertilizer around the base of the plant and blend into the surface of soil.
  • Water well after each application.
  • Avoid applying any type of fertilizer on days when temperatures may exceed 80 degrees for an extended period of time.

Warnings

-Always wear protective gloves and a face mask when handling chemical fertilizers.   
-Closely follow all directions and storage guidelines that are on the fertilizer label.

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