A Complete Analysis of the Latest Cultivation Methods for Sundews

Sundews are a major category of carnivorous plants, also known as felt moss, summer traceless, white flower leaf, etc. Their leaves are densely covered with crystal-clear “dewdrops” that shine dazzlingly, making them deeply loved by people. However, for their prey these dazzling lights are “deadly”, because sundews hunt precisely through these “dewdrops”. Now let us take a look at the cultivation methods for sundews!

Cultivation Substrate

1. Except for tuberous sundews, other types of sundews do not have high requirements for the substrate. Pure sphagnum moss can be used, or two parts sphagnum moss or peat mixed with one part perlite, plus one part akadama, bark, vermiculite, or other substrates. To prevent green algae from growing on the surface of the substrate, a thin layer of non-decaying granules such as akadama can be spread on the surface, avoiding contact between the lower substrate and light.

2. The cultivation substrate for tuberous sundews is configured differently, requiring sandy soil with good water permeability. Peat and perlite can be mixed at a ratio of 1:2, or peat, perlite, and river sand can be mixed at a ratio of 1:1:1. It is also best to use a large pot with a diameter and depth of 15 cm or more.

Humidity Management

1. Sundews do not have high humidity requirements, needing to be controlled at 40-90%. When it is dry in winter, indoor humidity can generally meet the requirements. When it is hot in summer, the humidity must not remain above 90% for several consecutive days, otherwise it may cause stem and leaf rot. If this occurs, ventilation should be strengthened immediately. In cool seasons, humidity as high as 95% generally does not cause problems.

2. Sundews that have just been repotted or newly planted after mailing are relatively fragile and usually have no mucus, requiring increased humidity. The simplest method is to use a glass tank, a transparent bag, or similar methods for enclosed cultivation. However, remember that during enclosed cultivation they must not receive direct sunlight, otherwise the sudden rise in temperature will suffocate the plants to death. They should be placed in a bright, cool location. After 1 week, gradually increase ventilation until they adapt to an environment without enclosed cultivation, then gradually increase light.

Light Management

1. The vast majority of sundews prefer sun and tolerate full exposure. They should be provided with more than 4 hours of direct light daily as much as possible, and are suitable for placement on a balcony or windowsill with good lighting. If full-day direct light can be provided, they will display very vivid colors and their mucus will become more viscous. If there is no good lighting environment, bright indirect light should be provided all day. Generally, sundews other than Northern Territory sundews can also grow normally, but the plants will appear emerald green, and their growth vigor and disease resistance will be relatively poor.

2. Northern Territory sundews are the type of carnivorous plant most tolerant of full exposure and also have the highest light requirements. It is best to provide an environment with all-day direct sunlight. Less than 4 hours of direct light may cause poor growth, and if they receive no direct light for a long time they will die. If there is no good lighting environment, using a plant light for supplemental lighting is a good choice.

3. Drosera prolifera and Drosera binata are two special sundews that grow in woodland with weaker light. They do not tolerate long periods of direct light and high temperatures, and only need bright indirect light.

4. Some sundews that are relatively afraid of heat or have summer dormancy habits should also be placed in a slightly dimmer, cooler place in summer, avoiding direct light from 11 AM to 3 PM as much as possible. A 30-80% shade net can also be used for shading. Common ones include Drosera binata, Drosera filiformis, Cape sundew, Drosera regia, Drosera adelae, etc.

Watering Control

1. Sundews are generally relatively tolerant of moisture. The “tray method” can be used for water supply, that is, placing the flower pot in a water tray, glass tank, or other container with water, allowing water to seep through the entire pot on its own. Simply keeping about 1 cm of water in the tray can keep the substrate moist.

2. Sundews have relatively high water quality requirements. When watering, use soft water with low calcium, magnesium, and other mineral content. Hard water will slow the growth of sundews, and especially at high temperatures may cause stem and leaf rot, followed by rapid death. If this has already occurred, the substrate can be replaced with clean substrate as treatment, and soft water such as rainwater, bottled water, purified water, air conditioner condensate, or water from a reverse osmosis purification machine should be used.

Temperature Control

1. Pygmy sundews: Pygmy sundews do not have high temperature requirements. Their survival temperature is mostly between 0-37 degrees, with the optimal temperature between 5-30 degrees. After the temperature drops below 15 degrees in late autumn, many “gemmae” will begin to grow at the growth point in the center of the plant. These gemmae will mature after one month and will sprout like seeds to grow into new plants.

2. Temperate sundews: Temperate sundews are relatively tolerant of low temperatures. Below 10-15 degrees, their insect-catching leaves will slowly wither, and they will grow some very small dormant leaves without mucus. In winter they can generally survive temperatures as low as 0 degrees, and after warming in spring they will grow very vigorously. In summer, temperate sundews are also generally relatively heat-tolerant, and most can safely survive high temperatures of 37 degrees. However, when exceeding their optimal growth temperature (about 30 degrees), they should be placed in a slightly dimmer, cooler place.

3. Tuberous sundews: Tuberous sundews are a type of carnivorous plant that is particularly difficult to grow, and few people cultivate them. When the summer temperature exceeds 25 degrees, the stems and leaves of tuberous sundews above the ground will wither. At this time, the soil should be kept in a very dry state, and should not be watered thoroughly. If too wet, their tubers will rot very easily, but the soil must not dry out completely either. The soil needs to be kept slightly moist, and the plants should be placed in a dark place.

4. Northern Territory sundews: Northern Territory sundews are a type of carnivorous plant that likes heat and fears cold. Their survival temperature is between 12-42 degrees, with the optimal temperature between 25-35 degrees. There is basically no need to worry about getting through summer. When the temperature remains below 25 degrees for a long time in autumn, growth will slow down, and the temperature should be raised by strengthening light and other methods. Below 10 degrees in winter, they die very easily, and at this time it is best to have heating equipment for warming.

5. Tropical, subtropical, and other unclassified sundews: Tropical, subtropical, and other unclassified sundews mainly grow in South America and Africa, mostly in tropical and subtropical regions. Their habits do not have very distinctive characteristics, and their preferred temperatures also vary. As long as the temperature is suitable, they can grow all year round.

Pest and Disease Control

1. Pest and disease control: In spring and summer each year, the new shoots of sundews may be attacked by aphids, causing deformed or withered leaf growth. When pests such as green caterpillars and cutworms have nothing to eat, they may all gnaw on sundew leaves. When traces of gnawing are found on the leaves, promptly check whether such pests are near the plant and capture and kill them. Broad-spectrum (general-purpose) insecticides can also be used for killing. When using them, simply spray the leaves moist; avoid large amounts of spraying.

2. Fungal infection: Fungal infection of sundews is a problem prone to occur in summer, usually when the environment is enclosed, unventilated, and the temperature is relatively high. Sundews should be provided with a well-ventilated environment, and ventilation should also be carried out regularly during enclosed cultivation. When fungus is likely to occur, a broad-spectrum fungicide can be sprayed once every 1-2 weeks for prevention. If fungus has already begun to grow on the substrate or plants, ventilation must be strengthened immediately, diseased parts removed, and some fungicides with better therapeutic effects used. Ask clearly at the time of purchase and treat the disease accordingly.