1. First of all, it may be that the soil is alkaline. You know cycads are more suitable for slightly acidic sandy soil. If the soil is alkaline, the leaves of Cycas will turn yellow. Irrigation of basin soil with 500 times ferrous sulfate solution once a week can also improve the chromaticity of leaves as long as it is irrigated several times continuously.

2. If the light is insufficient, the cycad must bask in the sun when it grows new leaves. Only when the leaves are hardened will they be appreciated in the semi-shade. If there is no good lighting conditions during the growing period, it will not grow as expected.

3. Another situation is that there is too much watering. Although cycads need a lot of water in the growth period of new leaves, they can't make the basin soil moist for a long time, which will lead to the lack of oxygen in the roots, poor growth and yellow or stiff leaves. Solution: Water should be controlled immediately at this time.

4. It is also possible that there is too little watering. Cycas leaves will turn yellow due to lack of water and drought. Its characteristic is that the old leaves turn yellow from bottom to top. If the water shortage lasts longer, the whole plant will turn yellow and even die. Water it in time.

5, too much fertilization, Cycas will also cause yellowing of leaves because of too much fertilization or too high concentration; It is characterized by thick, shiny and uneven young leaves; At this time, it is necessary to control fertilizer, intertillage and water.

6, too little fertilization, at this time, Cycas will have insufficient fertilizer, and low fertilization concentration will also lead to yellowing of leaves and long fertilization interval; Its characteristic is that young leaves and tender stems turn yellow first. If fertilization is not timely after seeing this phenomenon, the leaves will turn yellow and even the whole plant will die. For flowers lacking fertilizer, it is forbidden to use concentrated fertilizer in large quantities at one time, which is easy to cause root burning.

7, pests and diseases, which can also be said to be the reason for the yellowing of Cycas leaves, pay attention to check whether there are insects on the leaves, such as red spiders, scale insects and so on. If there is, it can be eliminated by spraying 0.2% essential oil solution and washing powder solution. For example, leaves with yellow spots can be sterilized by spraying garlic liquid or carbendazim.