
It’s a cruel trick of Mother Nature that the most glorious weather of the gardening season coincides with the decline of most blooming plants. Asters (Symphyotrichum spp.), however, don’t play along with the prank. Like garden mums, asters flower in response to the shortening days of fall, giving gardeners a beautiful display of buds that can bloom from August through October. Native to North America, New World asters comprise many species in several different genera of plants, as well as dozens of cultivars, but for gardeners, asters are simply great flowers that provide purple or blue daisy-like flowers late in the season.
Aster Care
Although home and garden centers often market asters as a seasonal purchase among displays of pumpkins and hay bales, asters are long-lived perennials that can become a permanent part of your landscape. These fast-growing perennials will be ready to put on a good fall display in their first year, and once established, they will hold their own for many years.
While you can grow aster flowers from seeds planted in the springtime, it may take several years for them to mature into full-sized plants. More often, asters are planted from potted nursery specimens. They do best in loamy, well-draining soil, and desire a good amount of space around the plants to allow room for their roots to expand.
Every three years or so, the root clumps should be dug up and divided to keep the plants from getting too woody and dying out in the centers. The woody center can be discarded, with the outer portions replanted at the same depth as before.
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Light
Plant aster flowers in an area that boasts full sun for the majority of the day. Too much shade can cause lanky plants and fewer flowers, especially for the more common cultivars and hybrids. There are some native species varieties, however, that will do quite well in partially shady conditions.
Soil
Asters appreciate loamy soil that’s slightly acidic, with a pH ranging from 5.8 to 6.5. If your soil is alkaline, you can correct it by adding organic matter such as well-rotted manure, leaf mold, or compost.
Water
Keep new plantings moist and continue watering regularly until the flowers are finished blooming. As a rule of thumb, the soil your asters reside in should stay consistently moist but never saturated. One thing to note: Try to water the base of your asters without splashing water on the leaves—doing so can cause mildew or fungal growth. One inch of rain or watering once a week is usually recommended for most perennial plants.
Temperature and Humidity
Aster flowers thrive in cooler temperatures and are frost-hardy, able to withstand near-freezing temperatures temporarily. When it comes to humidity, asters have no special preferences and therefore will not need increased humidity levels or extra spritzing.
Fertilizer
Asters are moderate feeders, and they appreciate being fed with a balanced flower fertilizer twice a month, beginning in spring and continuing until the blooms begin to open. Excessive nutrients can shorten the blooming time, so stop fertilizing asters in August.
Types of Asters
The taxonomy of asters is somewhat complicated, as it now includes several genera of plants, all within the Asteraceae family. Most gardeners do not need to worry too much about the taxonomical details, as all these plants are sold as asters and all have the familiar daisy-like flowers and perform the same way in the garden. Some of the more popular cultivars include:
‘Celeste’: These dark blue flowers bloom early and feature bright yellow centers.

‘Hazy’: Another early bloomer, the “hazy” aster boasts raspberry-pink flowers with yellow centers.

‘Puff’: The puff aster is hardier than many other white cultivars and will bloom among the earliest.

SOURCE: THE SPRUCE














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