Symphyotrichum oblongifolium

Aromatic aster requires significant light exposure to thrive, ideally resembling its native environment conditions. It needs full sun, defined as above 6 hours of sunlight a day, or partial sun, about 3-6 hours of sunlight a day. Insufficient light may lead to weaker growth, although the plant generally tolerates excessive light well. It's important to observe how sunlight moves through your garden to ensure the spots chosen provide a balance of light and shade, ensuring the plants' happiness.

Indoor aromatic aster plants require adequate lighting for optimal growth, especially when natural sunlight is insufficient, such as during winter or in less sunny spaces. Artificial lights, like LED, offer a vital solution by promoting faster, healthier growth. For full sun plants, 30-50W/sq ft of artificial light is needed; partial sun plants need 20-30W/sq ft, and full shade plants need 10-20W/sq ft. The light source should be placed 12-36 inches above the plant, mimicking natural sunlight, and most plants need 8-12 hours of light per day.

Symptoms of light deficiency in aromatic aster include smaller new leaves, leggy or sparse growth, faster leaf drop, slower or no new growth, and lighter-colored new leaves. Excessive sunlight can cause chlorosis (leaves turning yellow), sunscald (damaged leaves from intense light), leaf curling (as a defense mechanism to reduce water loss), wilting (due to increased water loss), and leaf scorching (brown, dry edges on leaves). These symptoms help in identifying whether the plant is receiving too little or too much sunlight.

To address insufficient sunlight, gradually move your aromatic aster to a sunnier location each week, aiming for at least 6 hours of direct sunlight daily. Use a south-facing window and open curtains during the day for indoor plants or consider artificial lighting if the plant is large or not easily movable. For outdoor plants, avoid sudden light intensity changes to prevent sunburn. If light is obstructed, prune obstructions or transplant smaller plants during their dormant period to a sunnier location with good drainage. Remember, parts of the plant damaged by insufficient sunlight may not recover, but new growth should be healthy after adjusting light exposure.

The Aromatic aster, or Symphyotrichum oblongifolium, thrives in moderate temperature environments, ranging between 41 to 95 ℉ (5 to 35 ℃). This range simulates its native growth environment, ensuring its health and vitality. To maintain optimal temperatures for the plant, adjustments are necessary during extreme seasonal fluctuations. During the hotter months, providing shade or relocating the plant to a cooler environment is beneficial. In contrast, in colder months, it's crucial to offer warmth and shelter to keep the plant healthy. Although the Aromatic aster has strong cold resistance and usually doesn't require special frost protection measures, if winter temperatures are expected to drop below -30℃, it's important to protect the plant by covering it with soil or straw and water it abundantly before the first freeze to ensure the soil remains moist throughout the winter.

Aromatic aster is cold-tolerant, thriving best when temperatures remain above 5℃ and typically kept above -25℃ during winter. However, if temperatures fall below -30℃, there might not be noticeable changes during the winter, but a decrease in sprouting or a complete lack of sprouting could occur in spring. In anticipation of or after experiencing such low temperatures, it is recommended to remove any parts of the Aromatic aster that have failed to sprout come spring. This step is crucial for revitalizing the plant and encouraging new growth.

During the summer, it's important to ensure that the temperature surrounding Aromatic aster does not exceed 35℃. If temperatures rise above 38℃, the plant's leaves may lighten in color, become prone to curling, suffer from sunburn, and, in severe cases, the entire plant may wilt and dry. To mitigate these issues, trim away any sunburned and dried-up parts of the plant. Relocating the plant to a spot that provides ample shade during the midday and afternoon sun, or utilizing a shade cloth, can offer necessary relief. Additionally, watering the plant in the morning and evening helps keep the soil moist, further protecting it from the adverse effects of high temperatures.