Ardisia mamillata (scientific name: Ardisia mamillata Hance) is a low-growing shrub in the family Primulaceae (Myrsinaceae), genus Ardisia, with creeping woody rhizomes and erect stems no taller than 15 cm. The leaves are alternate or clustered at the apex of the stem, obovate to oblong-oblanceolate, with acute or obtuse tips and inconspicuous sparse rounded teeth along the margins; both surfaces are green or dark purplish-red and covered with rusty-colored or sometimes purplish-red strigose hairs. The umbel inflorescence is borne singly at the apex of special lateral flowering branches; the calyx is united at the base, with sepals lanceolate or narrowly oblong-lanceolate; the petals are pink, rarely white, ovate; the anthers are lanceolate; the ovary is spherical. The flowering period is from June to July, and the fruiting period is from November to January of the following year, sometimes extending to June.
Cultivation Techniques
Light: Through artificial shading to control light, comparative experiments were conducted under full sun, 50%, 75%, 85% and 95% shading. The results showed that Ardisia mamillata grows best under a 50% shading rate, with seedlings growing rapidly, strong leaf photosynthesis and increased chlorophyll; under full sun, seedlings grow slowly and leaves become scorched yellow; as the seedlings grow and develop, the shading rate should gradually increase. During the flowering and fruiting period, the shading rate should be controlled within 50%; after fruit set, the shading rate should gradually increase and be controlled within 95%, gradually reducing chlorophyll in the leaves and increasing red pigment, so that once the leaves become thick and turn red, they can become commercial flowers.
Temperature: The optimal temperature for the growth of Ardisia mamillata is 15-25°C. Growth stops below 5°C or above 35°C; frost damage occurs at 0°C; leaves are scorched at 40°C; it cannot tolerate high temperatures above 40°C.
Humidity: Ardisia mamillata requires loose soil; it prefers warmth and humidity, has fine roots that naturally grow in the surface soil layer, and its leaves are thin and large, so it needs more water. Therefore, soil humidity should generally be maintained at 30-40% and air humidity at 75%-80%.
Soil: Ardisia mamillata prefers fertile, loose, well-drained slightly acidic soil with a pH of 5.5-7.0, and absolutely avoids alkaline, compacted soil.
Watering: The water quality should be clean and pollution-free. Water according to the season, weather, placement location, flower pot and pot size, and the drainage performance of the potting soil, keeping the potting soil neither dry nor waterlogged. In spring, water consumption is not large, so watering should be done during the day, once every 3-4 days; in summer and autumn, during the peak growth period, due to higher temperatures, a large amount of water needs to be absorbed from the potting soil, and leaf transpiration is also high, so watering should be done in the morning and evening, once every day. In late autumn and winter, as temperatures drop, growth gradually slows, leaf transpiration decreases, and the plant enters dormancy, so watering should be done at noon, once every 2-3 days.
Fertilization: Through the cultivation and domestication of wild Ardisia mamillata, the following fertilization principles were derived: Ardisia mamillata is in its peak growth period in summer and autumn, consuming more nutrients, so thin fertilizer should be applied frequently to meet its growth needs; in winter and spring, when it is basically dormant, less fertilizer can be applied. During the seedling growth period, nitrogen fertilizer is mainly used, applied thinly and frequently, once every 15 days; during the medium seedling growth period, nitrogen fertilizer is still mainly used, with an increased amount, once every 20 days; during the flowering and fruiting periods, phosphorus and potassium fertilizers should be increased, with a moderate amount of nitrogen fertilizer, to promote fruit enlargement and improve the fruit-setting rate.
Pest and Disease Control
The main disease of Ardisia mamillata is stem rot, with symptoms of rhizome rot and necrosis and leaf wilting. Its causes may be compacted soil with poor water and air permeability; improper watering causing the potting soil to become too wet and waterlogged; or excessive or overly concentrated fertilization burning the root system.
Control methods: Prepare nutrient soil with good water and air permeability and disinfect it, manage water and fertilizer scientifically and reasonably, and spray 800-1000 times diluted thiophanate and other pesticides during the plum rain and high-temperature seasons to prevent disease occurrence.
Pests
The main pests are scale insects and fruit-boring insects. Scale insects often gather on branches, leaves and fruits, sucking sap from branches and leaves, and in severe cases can cause branch wilt or death of the whole plant. Fruit-boring insects mostly prefer to feed in the morning; after emergence, females pierce the fruit with their ovipositors to suck secretions and lay eggs between the fruit skin and flesh, leaving oviposition marks under the fruit skin. The eggs hatch into larvae inside the fruit, and after hatching, the larvae hide in the fruit pulp to feed, causing fruit rot and fruit drop, seriously affecting the fruit-setting rate.
Control methods: Strengthen greenhouse management, timely cultivate and loosen the soil, fertilize and irrigate to meet the water and fertilizer needs of Ardisia mamillata and improve its insect resistance. At the same time, in combination with shaping and pruning, cut off pest-infested branches and leaves and burn them in a centralized manner, which can greatly reduce the pest population. Protecting and utilizing natural enemies and implementing biological control is an effective way to control scale insect populations. In addition, when adopting other control measures, especially chemical control, avoid killing natural enemies as much as possible. Spray pesticides for prevention during the peak hatching period of scale insects in June-July and during the flowering and fruiting period; generally, spray once every week with 40% omethoate emulsifiable concentrate, for 3-4 consecutive sprays, to achieve good control results.