False Shamrock
False Shamrock (Oxalis triangularis) is a tender perennial in the Wood sorrel family. It is grown as an ornamental plant, and it is often used indoors as a houseplant. The plant is a low-growing perennial with an upright habit, typically producing clumps of foliage 8-12 inches high. It has rhizomatous roots and is best grown from divisions. Leaves form a tight rosette with numerous triangular leaflets that fold each evening and can remain closed on overcast days. The leaves may be solid green or have a purplish mottling; some newer cultivars have deep purple to burgundy foliage. False Shamrock will also produce small white flowers in the late spring.
Water the shamrock regularly, allowing the top 1 inch of soil to dry out between waterings. During the winter, allow the top two inches of soil to dry out before watering. Misting is not necessary and can be harmful to the plant, leading to disease and fungal issues. Clay pots help to moderate the amount of moisture, while plastic pots may require more frequent waterings.
False Shamrock grows best in medium to bright, indirect light. Direct sunlight should be avoided; too much direct light will scorch the plant’s foliage. Plant it near south or east-facing windows, but be sure to provide some protection from bright sunlight. Keep the plant away from northerly exposure which tends to discourage flowering.
False Shamrock prefers temperatures between 65–75°F (18–24°C) during the day and 10–15°F (3–9°C) cooler at night. It is very sensitive to cold drafts and temperatures below 50°F (10°C) and cannot tolerate temperatures above 85°F (30°C).
False Shamrock likes moderate to high humidity. During the hot, dry summer months, it is best to provide extra humidity by setting the pot on a shallow tray full of pebbles and water. Make sure the pot is not sitting in the water, as the roots may rot. A humidifier can also be used in the room to help keep the plant happy.
False Shamrock prefers a light, well-draining soil. A combination of peat moss, perlite, and Vermiculite works well. Make sure the pot has several drainage holes to allow for proper drainage.
Fertilize the plant with a balanced fertilizer every two weeks during the spring and summer growing season. Choose a fertilizer with an N-P-K ratio of 10-10-10 (or 10-5-8). Alternatively, you can use a fertilizer specially formulated for houseplants. Over-fertilizing can lead to nutrient imbalances, so it is important to stick to the recommended dosage.
False Shamrock is highly susceptible to pests including aphids, spider mites, mealybugs, and scale. Look out for sticky sap on the leaves, as this is telltale sign of a pest infestation. To get rid of pests on the shamrock, use an insecticidal soap spray and spray the underside of the leaves. You may need to repeat the process several times until the pests are eliminated. Make sure to also keep the leaves free of dust, as dust can make it difficult for the plant to fight off pests.
False Shamrock prefers a fairly small pot size to encourage the formation of growth-provoking roots. Repot the plant every two to three years in spring just before the flowering season when the plant is actively growing. Choose a pot that is one size larger than the current one, and replace the potting soil with fresh soil mix.
For indoor and container-grown shamrock plants, occasional pruning will help to keep the plant looking its best. Cut off any dead or damaged leaves as soon as they appear and prune off any long stems that are not producing foliage. You can also trim off the seed heads as soon as they appear to prevent the plant from self-sowing.
False Shamrock prefers a mulch of compost or peat moss. The mulch helps to keep the soil moist and provides extra nutrients to the soil.
False Shamrock is easily propagated by dividing the root system in early spring. Lift the plant out of the pot and divide the rootball into several sections. Replant each section in a new pot of soil, and keep the soil consistently moist. With time, the plant will produce more shoots.
No support is needed, but using a stake to keep the foliage upright is recommended.
False Shamrock likes a rest period when the days are short and the temperatures are cool. During the winter, the plant will go dormant and you can reduce the amount of water and fertilizer. This will help to encourage the plants to produce more stems and foliage in the spring.
False Shamrock is toxic to cats, dogs, and horses. The leaves contain oxalates which are poisonous to animals when consumed. It is best to keep the plant away from pets and children.
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