Cultivation Methods and Care Tips for Astilbe

Astilbe is also known as Chinese astilbe. Its flowers are most notable for their rich and colorful hues, and its flowering and fruiting period runs from June to September. It can be planted in flower beds, flower borders, and more. It can also be used as a cut flower or grown in pots, and has very high ornamental value. Below are the detailed cultivation and care tips for astilbe flowers. Those who love flowers can give them a try.

Environment

Astilbe prefers a semi-shaded, cool and moist environment. It is cold-hardy but not tolerant of severe cold, nor of drought, and dislikes direct sunlight. Its growing temperature is 15 to 25 degrees. In winter, keep the weather cool, but avoid severe cold.

Soil

Astilbe has strong adaptability. It prefers slightly acidic, neutral, well-drained sandy loam, and also tolerates lightly alkaline soil. For potted plants, a mix of leaf mold, garden soil, and river sand can be used.

Water and Fertilizer

During the growing period, apply a dilute nitrogen-phosphorus-potassium fertilizer once a month to astilbe to promote growth and flower buds; stop nitrogen fertilizer once flowering begins. After autumn arrives, stop fertilizing the plants in early October, as the plants are about to go dormant. Water when the soil is dry, watering thoroughly; do not let it get too dry or too wet. In summer, when there is a lot of rain, pay attention to drainage and flood prevention to avoid root rot.

Light

Astilbe prefers semi-shade, but both growth and flowering require relatively high light intensity for abundant and vivid blooms. When summer temperatures are too high, ventilation must be strengthened. During frost periods, provide partial shade to avoid direct sunlight. Remember that in too shady an environment, the plants will produce fewer flowers.

Temperature

In winter, keep the indoor temperature at 10 to 12 degrees. For plants grown in the ground, straw can be used as a cover. For potted plants, while avoiding severe cold, maintain cool weather; temperatures above 12°C will cause the leaves to grow larger and the flower stems to become thinner; temperatures below 6°C will delay flower bud development.

Management

① Astilbe is a Chinese medicinal herb. After autumn (after the flowers fade), the plants can be harvested for medicinal use, and the roots will sprout new shoots the following spring. In spring, the plants can also be pinched back to encourage more side shoots.

② When cultivating astilbe, choose a slightly moist and cool environment so that the roots will not grow deep into the soil, which helps keep the plant compact. In winter, for potted plants, relatively high humidity or damp leaves can easily trigger gray mold.

For astilbe flowers, the main things are fertilizer and water management and the growing environment, so everyone must pay attention when cultivating them. The above are the key tips for astilbe flower cultivation. Remember to save them.

How to Cultivate and Care for Perennial Herbaceous Flowers

Perennial herbaceous flowers, also known as perennial herbaceous ornamentals, refer to a class of perennial herbaceous ornamental plants whose aboveground parts flower, set seed, and wither, while the underground parts form well-developed roots that can overwinter in the open ground and sprout, grow, flower, and set seed again the following year. In plain terms, perennial herbaceous flowers are flowers that can "hibernate," and whose aboveground parts can sprout, grow, flower, and set seed again the following spring. The advantage of this class of flowers is that propagation and management are simple, and one planting can bloom for many years, making them highly suitable plant materials for urban greening and beautification. The underground parts of the plants persist through winter without forming enlarged bulbous or tuberous roots, and can still sprout and bloom the next spring and continue for many years. Most belong to the ecological type of cold regions. They can be divided into two major categories: relatively cold-hardy and relatively non-cold-hardy. The former can be planted in the open ground, while the latter require greenhouse cultivation. Division propagation is the main method, generally carried out during the dormant period. For species with few new shoots, methods such as cuttings and grafting can be used for propagation. Seed propagation is mostly used for breeding new varieties. In other words, perennial herbaceous flowers are flowers whose underground parts can persist in the soil through winter, and whose aboveground parts can sprout, grow, flower, and set seed again the following spring. Examples include purple coneflower, astilbe, blanket flower, black-eyed Susan, sea thrift, Iceland poppy, sedum, columbine, campanula, and salvia.

Flowering Mechanisms

Perennial herbaceous flowers have different flowering mechanisms. Generally speaking, perennial herbaceous flowers require photoperiod (day length) or vernalization (low temperature), or both. Understanding the special flowering mechanisms of perennial herbaceous flowers is one of the most important factors affecting the success of commercial perennial production.

Photoperiod Perennial herbaceous flowers often require photoperiod to stimulate flowering. Long-day plants need 14 hours or more of daylight to flower; day-neutral plants flower regardless of day length, but some varieties flower more under long days; short-day plants need short days to flower, generally less than 12 hours. Long-day plants can be stimulated to flower outside their natural flowering season through supplemental lighting. A simple and easy way to artificially create long days is night lighting, providing 4 hours of light from 10 p.m. to 2 a.m. the next day; using incandescent light of 50 lux to 100 lux is sufficient. Supplemental lighting can sometimes cause plants to become leggy, especially when incandescent light is used, so once flower buds appear, turn off the light source.

There are three key elements for successful vernalization, none of which can be missing: the plants prepared for vernalization must be fully mature; there must be a suitable low temperature, generally not higher than 5°C; and the appropriate low-temperature treatment time is generally 6 weeks to 10 weeks.

Low-temperature treatment when perennial herbaceous flower plants are immature has very poor results. Generally, before low-temperature treatment, ensure at least two months of vegetative growth. The Fast Lane varieties newly launched by the German company Benary take 3 to 5 months from sowing to flowering and can complete vernalization without low temperature, but vernalization can significantly shorten the time to flowering after transplanting and ensure uniform flowering.

Production Process

Using imported peat as the seedling medium can significantly increase the emergence rate and speed up seedling formation. A 300-liter package of peat can fill 100 to 120 trays of 200-cell plug trays, adding only one cent to the cost per cell. Especially for small seeds, the effect of using imported peat is even more obvious.

Sowing Time The general pattern of sowing, transplanting, and flowering for Fast Lane varieties is: sow from January to March, pot up from March to May, and flower successively from May to September. Even for Fast Lane varieties, after potting and recovery, placing them in a greenhouse at 0°C to 5°C for 1 month to 1.5 months can significantly increase the number of flowers and improve quality, so if greenhouse space is sufficient, it is recommended to carry out this process.

The general pattern of sowing, transplanting, and flowering for conventional varieties is: sow from September to November, pot up from November to March of the following year, and flower from April to August.

Best Time for Potting When the roots of plug seedlings grow out through the ventilation holes at the bottom of the plug tray and the roots form a mass, transplanting is convenient, and this is the best time for potting. If transplanting is late, such as when small old seedlings form, it will prolong the growing time and affect the quality of the finished product.

Growth Process Management After plug seedlings are formed, transplant them into plug trays or nutrient pots, or directly into commercial containers in one step. After 2 to 4 weeks of recovery, move them into a greenhouse with a nighttime temperature of 0°C to 5°C and a daytime temperature of 10°C to 15°C, and keep them there for 1.5 months to 2.5 months. During this period, always keep the medium in the pots moist. During this time, some special varieties that require long days to promote flower bud differentiation also need supplemental lighting, ensuring 12 hours to 14 hours of light; most varieties do not need supplemental lighting. After March, as temperatures rise, under greenhouse conditions with a minimum temperature of around 10°C, begin normal growth and care, carrying out fertilizer and water management, until the plants flower.

The advantage of this class of flowers is that propagation and management are simple, and one planting can bloom for many years, making them highly suitable plant materials for urban greening and beautification. The underground parts of the plants persist through winter without forming enlarged bulbous or tuberous roots, and can still sprout and bloom the next spring and continue for many years. Most belong to the ecological type of cold regions. They can be divided into two major categories: relatively cold-hardy and not cold-hardy. The former can be planted in the open ground, while the latter require greenhouse cultivation. Division propagation is the main method, generally carried out during the dormant period. For species with few new shoots, methods such as cuttings and grafting can be used for propagation. Seed propagation is mostly used for breeding new varieties.

Specifically, there are the following points:

1. Wide range of applications; they can be widely used in greening of garden landscapes, courtyards, roadsides, riversides, slopes, and other places.

2. One planting allows viewing in multiple places, and it is convenient, economical, and can save a large amount of manpower and material resources.

3. Most varieties have low demands on environmental conditions and can be managed extensively.

4. There are many varieties, with large variations in plant height, flowering period, and flower color; the duration is long, and the colors are rich and vivid.

5. Many varieties have strong abilities to purify the environment and resist pollution, as well as medicinal value.

6. Some varieties are excellent materials for cut flowers, potted flowers, and dried flowers.

Key Points for Cultivation and Care of Perennial Herbaceous Flowers