How to grow Justicia carnea? A detailed guide to the latest cultivation methods
Justicia carnea, also known as Brazilian plume flower, is a perennial evergreen subshrub of the genus Justicia in the family Acanthaceae. Its flowers are densely arranged in short panicles, rose-purple or pink, resembling coral in both shape and color, bright and elegant, and suitable for decorating rooms. It is native to the tropical and subtropical regions of the Americas and is now cultivated as an ornamental plant. It is grown in gardens in the southern provinces and regions of our country. Let's take a look at the cultivation methods for Justicia carnea!
Growth habits of Justicia carnea
Justicia carnea is a common potted ornamental flower in gardens. It blooms in summer and autumn. Its red inflorescences are especially soft and beautiful under bright sunlight. It has a long flowering period and is relatively shade-tolerant. As a potted plant, it is very suitable for indoor decorative arrangements, and potted plants are suitable for placement on balconies, in living rooms, bedrooms, and studies. In gardens, it is often used for cultivation and viewing along roadsides or in flower beds. Cultivation requires full sun or partial sun. It prefers loose, fertile, slightly acidic soil and likes a slightly dry or moist environment.
Propagation methods of Justicia carnea
Justicia carnea is commonly propagated by cuttings, generally in spring or autumn. Cut new branches or stem sections that have not yet formed buds as cuttings, 5-8 cm long, remove the lower leaves, leaving only 2-3 leaves at the top, and insert them into a growing medium made of equal parts peat soil and coarse sand. Water thoroughly, then cover the flowerpot with a plastic bag and place it in semi-shade. Roots will form in 15-20 days. After new leaves grow, it can be transplanted. The survival rate is relatively high.
Cultivation methods of Justicia carnea
1. Potting: For potted Justicia carnea, sandy leaf mold can be used, or ordinary garden soil mixed with an appropriate amount of river sand, sawdust, and cake fertilizer, which is set aside after being piled and fermented. 2-3 small seedlings can be planted in one pot at the same time, or one seedling can be planted alone. Pinching promotes the sprouting of lower side buds and forms a better plant shape.
2. Light: Justicia carnea likes light. In addition to appropriate shading during periods of strong summer sunlight to avoid direct sunlight, it should receive more sunlight in spring and autumn. In northern regions, it is generally brought indoors in early to mid-October. After being brought indoors, place it in a sunny spot, stop fertilizing, and keep the potting soil on the drier side. If watered too much at this time, it is prone to leaf drop and root rot.
3. Temperature: During the wintering period, the room temperature for Justicia carnea should be kept above 12°C. At the same time, it is advisable to spray and wash the branches and leaves once every 7-10 days with clean water close to room temperature. This can both increase air humidity and keep the plant clean, which is beneficial to photosynthesis and very helpful for its growth and flowering.
4. Watering: During the growing season, Justicia carnea not only needs to keep the potting soil moist frequently, but also needs frequent watering of the ground near the flowerpot to increase air humidity. Generally, apply a dilute cake fertilizer solution once every 10-14 days, and promptly cut off the faded flowers after flowering.
5. Pruning: After the seedlings of Justicia carnea are potted and grow to a height of about 15 cm, pinch them to encourage more branching and more flowering. For mature plants, carry out pruning once every year in early spring along with repotting, keeping the plant height below 50 cm and promoting a full plant shape.
6. Pests and diseases: Justicia carnea sometimes develops leaf spot disease, which can be sprayed with a 600-fold dilution of 65% zineb wettable powder. Pests include slug moths, leafhoppers, and aphids, which can be killed by spraying with a 2000-fold dilution of 10% dimehypo emulsifiable concentrate.