Arum Lily

Arum Lilies typically require regular watering during the growing season; soil should remain constantly moist but not soggy or soaked. During the colder months, they should only be watered when the soil is nearly dry, and in the winter dormancy period they should not be watered at all, as this can lead to root rot. Be sure to use room temperature water, and allow excess water to drain to avoid root rot.

Arum Lilies prefer bright, indirect light, but can also tolerate full shade. When growing indoors, locate them within 4-5ft (1-1.5m) of a south- or east-facing window. When growing outdoors, they should be placed under dappled shade or light filtered shade. While they are tolerant of potentially low light conditions, their growth rate and overall health is directly correlated to the amount of light they are receiving. Due to their preference for bright light, these plants should not be placed in full sun in summer.

Arum Lilies prefer temperatures between 45-80°F (7-26°C). They should not be subjected to temperatures below freezing, or those above 100°F (38°C). If the temperature drops below 45°F (7°C), then it may be best to bring the plants indoors as frost can be very damaging.

Arum Lilies prefer higher levels of humidity and need to be in areas with at least 40-50% humidity for optimal growth. When grown indoors, regular misting with lukewarm water and placing humidifiers or pebble trays can be very effective for maintaining optimal humidity levels.

Arum Lilies should be grown in a soil that is light and well-draining, such as a potting mix with equal parts peat, perlite and vermiculite. If necessary, compost, leaf mold or aged animal manure can be added to the soil mix. The potting mix should remain moist but not soggy or overly saturated.

Arum Lilies should be fertilized monthly during the growing season with an all-purpose liquid fertilizer, diluted to about half strength. It is best to fertilize when the soil is slightly moist, but avoid over-fertilizing as this can lead to plant burn. During the rest period, fertilizer should not be applied.

Arum Lilies are relatively resistant to pests but can succumb to some, such as aphids, mealybugs, scale, and spider mites. Regular checks should be done for signs of infestation, which include the presence of webs, discolored or distorted foliage, and appearance of small insects on the plant. In the case of an infestation, insecticidal soap or neem oil may be used to get rid of the pests. It is important to follow the directions of these products as they can be quite potent.

Arum Lilies should be repotted annually as they will become root bound in their pot over time. They prefer a loose, well-draining soil, and soil can be supplemented with less-absorbent materials such as perlite or sand, to further enhance drainage. During repotting, old soil should be removed and replaced with new soil, ensuring that no roots remain uncovered or facing the sun.

Arum Lilies are relatively low-maintenance plants, and do not need to be pruned. However, sometimes their stems will become weak or leggy, or produce excessive foliage on the lower part of the stem. In these cases, pruning the underside of the plant may be beneficial, so that it can put its energy into growing more lush and vibrant upper foliage.

Arum Lilies prefer light, airy mulch that does not hold too much moisture. Good materials include bark chips, chopped leaves, or straw. The mulch should be replaced annually.

Arum Lilies are propagated from rhizome divisions. These rhizomes should be divided in the spring season, and each division should have at least two shoots, and be 6-7 inches (15-18 cm) in length. The divisions should be planted in pots and kept in a partially shaded area. The new plants should be watered regularly with room temperature water, and once they are established, can be transplanted into garden beds.

Arum Lilies do not require support, as they are naturally strong-stemmed plants. If the stems seem leggy, you may provide a support stake to hold the stem upright until it gains more strength.

Arum Lilies should be given a rest period of 2 to 4 months, from late fall to early spring, during which time they should only receive minimal amounts of water. During the rest period, the plants’ growth will slow down, but will resume again when the temperatures and light conditions increase.

Arum Lilies are toxic to both pets and humans, and contact with sap or consumption of the plant can cause mild to severe symptoms of irritation and vomiting. Therefore it is important to keep the plants away from both children and house pets.