Thunia

Family. Orchidaceae.

Origin. India and Southeast Asia.

Description. The genus Thunia consists of 6 species of epiphytic or lithophytic, sympodial, deciduous orchids. The stems are vertical, do not branch, bear alternately arranged, simple, green, lanceolate or linear, narrow, sessile leaves 15 - 20 cm long. Inflorescences of several large, fragrant flowers appear at the tops of the stems during the flowering period. Flower colors include white, purple, pink, and burgundy. The flowering is very spectacular, but individual flowers are short-lived. After flowering, the plants shed their leaves. The following season, the leafless stems of the previous year continue to nourish the plant and allow it to grow new shoots.

Height. Grows quickly and reaches a height of 50 - 100 cm.

Care at home

Temperature conditions

During the growing season, the optimal temperature range is considered to be from 18 to 24° C. In winter, plants require a cool dormant period at a temperature of 6 - 10° C.

Lighting

A brightly lit place with plenty of reflected sunlight. The leaves do not like direct rays. In conditions of insufficient natural light, it can be grown under artificial lighting with fluorescent lamps.

Care

Thunia is the hardiest type of orchid and develops well in an enclosed space. Tall plant stems often need support.

Substrate for orchids

You can use a ready-made mixture for growing orchids or make your own from leaf humus, peat, sphagnum moss, pine bark or fern fibers, well-rotted manure and small pieces of charcoal. The soil should allow moisture and air to pass through to the roots of the plant; add coarse sand or perlite to improve drainage.

Feeding

Feed 2 times a month in spring and summer with liquid fertilizers for orchids in half concentration. 

Purpose

A large rare orchid with very lush flowering. Flowers are used for cutting.

Flowering time

Summer.

Air humidity

Place the thunia in a constantly ventilated area with good air circulation, but without cold drafts. Air humidity is increased using a humidifier or a tray with pebbles. Sprays can leave unsightly whitish spots on the leaves of the plant.

Water orchids at home

Water regularly during the growing season, thoroughly soaking the soil. After the leaves fall, watering should be minimal. For watering, use softened rain or bottled water. 

Transfer

Transplantation is carried out in the spring, with the first signs of new growth. After transplantation, watering is stopped for several days. Thunia likes rather cramped unglazed clay pots.

Reproduction

Often propagated by dividing large specimens during transplantation or by stem cuttings. Sometimes cuttings about 15 cm long are separated from the bush and rooted in a mixture of peat and sand at a temperature of at least 23 °C.

Pests and diseases

Plants rot when overwatered or insufficiently drained. The flower can be attacked by harmful insects such as spider mites and thrips.