A Detailed Guide to Pteris Fern Planting Methods and Key Technical Points

Pteris fern (scientific name: Pteris cretica L. var. nervosa (Thunb.) Ching et S. H. Wu). The plant is 50-70 cm tall. The rhizome is short and erect or ascending, about 1 cm thick, with its apex covered by dark brown scales. The leaf margins bear only small serrations, and the base of the terminal trifurcate pinna often extends downward along the rachis, with the pair below it also more or less decurrent. The leaf margins bear only small serrations, and the base of the terminal trifurcate pinna often extends downward along the rachis, with the pair below it also more or less decurrent. The leaves are papery when dry, green or grayish-green, hairless; the rachis is straw-colored and smooth on the surface.

Growth Habits of Pteris Fern

Pteris fern is native to China as well as Europe, Africa and other places. It grows at the edges of bamboo forests, in river valleys, on walls, beside wells, in rock crevices and in damp mountain forest areas. It prefers warm, humid and shady environments, and dislikes waterlogging. It requires shade, humid air and well-drained soil. It is relatively cold-tolerant, with an optimum growth temperature of 10-26°C, and the overwintering temperature can drop as low as 0-5°C.

Propagation Methods of Pteris Fern

1. Spore propagation: Pteris fern has no seeds and usually reproduces by asexual spores. Since the fresher the spores, the faster they germinate and the higher the germination rate, they should be collected and sown as soon as possible after maturing. Before sowing, sterilize the planting containers and substrate and keep them clean and hygienic. Research has found that the seedling formation rate is highest when 1/2MS with less than 2% sucrose added is used as the culture medium. After the spores germinate, the seedlings can be potted once they grow to a certain size.

2. Division propagation: Division propagation is the most common propagation method for ferns. This method is simple and easy to carry out, but the survival rate is low, so it is generally used when the propagation quantity is not large and is not suitable for large-scale production. For household potted Pteris fern, division is usually carried out in April and May. Before division, reduce watering to make it easier to remove the soil. After removing the soil, use a sharp tool to divide the plant into 3-4 clumps, then replant them separately in small pots and tend them carefully until new primary leaves grow from the tuber area and new plants are formed.

Cultivation Methods for Pteris Fern

1. Water and fertilizer: Pteris fern should be kept with moist potting soil, and water should be supplied abundantly during the growing season. Generally, watering once every 2-3 days is sufficient. Although the soil should be kept moist, for Pteris fern a slight drying between waterings is harmless. Pteris fern should not be overwatered either, as excessive moisture can cause the leaves to drop.

2. Temperature: The suitable temperature for Pteris fern is 16-28°C. Growth is poor above 30°C or below 15°C. In winter it must not go below 5°C. Winter care requires heating equipment. If no heating facilities are available, double-layer insulation can be used. In winter, when the temperature drops to 22-24°C in the afternoon, the greenhouse should be sealed promptly. Summer care requires cooling equipment (exhaust fan and water curtain).

3. Humidity: Pteris fern prefers a high-humidity environment and cannot tolerate dryness. During care, water should be sprayed frequently on the plants and the growing environment to increase humidity. The suitable humidity is about 75-80%. Excessive dryness can cause the leaf margins to turn yellow and withered, or even the entire leaf to turn yellow and withered.

4. Light: Pteris fern prefers a warm, semi-shaded environment and is suited to diffused light. It must not be exposed to direct sunlight, otherwise it easily wilts and curls. At 15 days after planting, controlling light at 2000-3000 Lux is more suitable for the growth of small seedlings. In the first month after planting, overall light control at 3000-4000 Lux is more suitable. In the second month, overall light control at 6000-7000 Lux is more suitable. In the third, fourth and fifth months, overall light control at around 7000-8000 Lux is more suitable.

5. Pruning: During the rapid growth period of Pteris fern, growth is fast, and overly dense leaf clusters lead to weakened growth. Poor ventilation and light penetration at the lower old leaves cause leaf withering, or water droplets accumulating on the leaves for a long time can easily cause leaf rot. Therefore, during the rapid growth period, pruning and repotting should be carried out promptly. It is best to prune in autumn, removing dead leaves and yellow leaves, so as to promote smooth ventilation between plants while maintaining the overall appearance of the plant.

6. Pests and diseases: Pteris fern is not easily affected by diseases and insect pests during the growing period. However, if the growing environment temperature is too low, ventilation and light penetration are poor, and air humidity is too high, it is highly susceptible to gray mold and damping-off, accompanied by pests such as red spider mites, scale insects and slugs, causing the plant to wilt, droop, or even die.