Sago Palm: What to Do When the Leaves of This Beautiful Ornamental Tree Turn Yellow, Plus Cultivar Value and Uses

The sago palm (Cycas revoluta) is a beautiful ornamental tree species and is extremely widely cultivated. The sago palm is a light-loving plant, and improper care can easily cause its leaves to turn yellow. So do you know what to do when sago palm leaves turn yellow? What cultivars are there? What value and uses does it have?

I. What to Do When Sago Palm Leaves Turn Yellow

1. Insufficient light

During the period when the sago palm grows new leaves, it must be kept in full sun until the leaves harden, after which it can be moved to a semi-shaded spot. If sufficient light cannot be guaranteed during the growing season, its leaves are prone to turning yellow.

2. Improper watering

Improper watering falls into two categories: overwatering and underwatering. During the growth period of new leaves on the sago palm, sufficient water must be provided, but the potting soil must never be left waterlogged for long periods, otherwise the roots are prone to oxygen deprivation, leading to poor plant growth and subsequently yellowing leaves. Of course, lack of water can also cause leaves to turn yellow, with the specific characteristic being that the leaves turn yellow from the bottom upward, with old leaves yellowing first. If water is not given in time, the leaves of the entire plant will turn yellow, and it may even die.

3. Improper fertilisation

If too much fertiliser is applied, or the fertiliser concentration is too high, it can also cause sago palm leaves to turn yellow. This shows as young leaves that are thick and glossy with an uneven surface. The solution is to control fertiliser use, carry out inter-row cultivation, and water moderately. If the yellowing starts first at the young leaves and tender stems of the sago palm, it is very likely caused by insufficient fertilisation combined with overly long intervals between feedings. In this case, fertiliser must be applied promptly, otherwise the whole plant's leaves will turn yellow and it may even die. Note that you must never apply a large amount of concentrated fertiliser at once, as this will burn the roots.

4. Alkaline soil

The sago palm prefers slightly acidic sandy soil. Soil alkalinisation can also turn sago palm leaves yellow. You can water the potting soil with a 500-fold dilution of ferrous sulfate solution, once a week, for several consecutive applications, which can alleviate the degree of leaf yellowing.

5. Pests and diseases

Pests and diseases are also one of the causes of sago palm leaves turning yellow. Carefully check whether there are spider mites, scale insects, etc. on the leaves, and spray pesticide promptly for the corresponding control. If yellow spots appear on the leaves, you can spray carbendazim and similar fungicides to sterilise.

II. What Cultivars of Sago Palm Are There

1. Fork-leaved sago palm

Also known as Longkou sago palm. It is mostly distributed in Vietnam and nearby areas. The trunk is relatively short, only about 20-60 cm tall, about 10-12 cm thick at the base, and about 4-6 cm thick at the tip; the surface is fairly smooth and dark red in colour. The large fronds are 2-3 m long, and the spacing between the small leaflets is large, reaching about 4 cm. The small leaflets are 20-30 cm long and 2-2.5 cm wide, extending in irregular directions and growing in a forked manner. Its distinguishing feature is that the leaf margins of the small leaflets are wavy, with blunt pointed tips, and the surface of young leaves is covered with a white powder.

2. Brazilian iron tree

Its scientific name is Dracaena fragrans, and it is also known by other names such as Brazilian thousand-year tree and golden-edged fragrant dragon's blood tree. It is relatively tall, reaching over 6 m in height; potted specimens are generally 50-150 cm tall and have branches. Its leaves are clustered at the top of the stem, curved and bow-shaped, bright green and glossy. Its flowers are small and fragrant.

3. South American sago palm

The South American iron tree is mainly single-trunked, with a trunk generally 15-30 cm tall, few branches, sometimes appearing clumped, cylindrical in shape, and densely covered on its surface with dark brown leaf scars. Its leaves are mainly large even-pinnate compound leaves, about 60-120 cm long, with petioles about 15-20 cm long; there are about 7-12 pairs of pinnate leaflets, elliptical in shape with unequal sides. It is dioecious, with male inflorescences resembling pinecones and female inflorescences resembling a hand shape.

4. Bicate sago palm

Its place of origin is southwestern Yunnan, and it is also distributed in India, Nepal, Myanmar, Thailand, Cambodia, Vietnam and other places.

Its trunk reaches about 3 m in height and is cylindrical. The large fronds are about 1.2-1.5 m long, bearing small leaflets, about 80-120 pairs, about 15-20 cm long and about 0.6-0.8 cm wide, with margins slightly turned down, thickly leathery in texture, very hard, and arranged asymmetrically. On both sides of the petiole there are spines, relatively sparse, about 2 mm long, with tips slightly curved downward.

III. What Value and Uses Does the Sago Palm Have

1. Ornamental value

The sago palm is a famous ornamental tree species. It is long-lived and has a graceful, elegant appearance, with an antique, refined tree shape and a thick, sturdy trunk as hard as iron, displaying a tough and powerful vitality. In addition, the sago palm's fronds are smooth and glossy, remaining evergreen all year round, and are quite effective for beautifying the environment. In southern China it is mostly planted in front of courtyards, beside steps, or in lawns, while in the north it is suitable for use as a large potted plant to decorate and adorn courtyards, corridors and halls, looking extremely beautiful.

2. Medicinal value

The leaves, flowers, seeds and roots of the sago palm can all be used as medicine, so it can be said to be a plant whose every part is treasured. The leaves can be harvested throughout the year and mainly contain sugars and amino acids. Their main medicinal functions are clearing heat, stopping bleeding, and dissipating blood stasis, and they also have certain effects on bruises and swelling, blood in the urine, and stomach pain. The flowers are mainly used to regulate qi and relieve pain, and to tonify the kidneys and secure essence. The seeds can be used to calm the liver and lower blood pressure. For high blood pressure. The seeds can be used to calm the liver and lower blood pressure. The roots are mainly used to treat pulmonary tuberculosis with coughing of blood, toothache, lumbago, kidney deficiency, bruises and injuries, and so on. Overall, the sago palm is a plant with multiple medicinal values.

3. Edible value

The stem of the sago palm contains starch, which is edible. The leaves are rich in amino acids and sugars and can provide ample nutrients for the human body. Under normal circumstances, eating sago palm leaves does not cause side effects in the human body, but pregnant women must not eat them, otherwise it may affect the health of the fetus and the mother.