Use summer oil to get rid of spider mites

I have been growing organic xiao bai cai in mixed cocopeat soil, but recently noticed silvery white spots on the bigger leaves. I have checked the bottom of the leaves and found no insects. I fertilise once a week and water sparingly once a day. What is wrong?

Melvin Chan

Your vegetables seem to have been infested with spider mites, which are sap-sucking pests that appear as small red dots. Use summer oil, which is available at local nurseries, to suffocate them. Repeated and thorough applications of the pesticide are required to keep the pest population in check.

Ensure your plant is not suffering from moisture stress. Plants with roots that are too dry or wet can be prone to pest attacks.

Euphorbia cannot be propagated via stem cuttings

My cactus is flowering. What is its expected lifespan and how can I propagate it?

Adrian Ling

Your plant is likely Euphorbia flanaganii, commonly known as Transkei Medusa’s Head. It is a perennial and, if well taken care of, can grow for many years.

This plant cannot be propagated via stem cuttings. You will need to pollinate the flowers and obtain seeds to grow into new plants that will develop the same radial, sprawling growth form.

Dwarf Yellow Mussaenda is a common shrub

I spotted these flowering shrubs in Yishun. Under many clusters of small yellow flowers, there appears to be a pale green leaf. What is this plant?

Tan Pin Ho

This plant is the Dwarf Yellow Mussaenda (Pseudomussaenda flava), an ornamental shrub commonly planted in local landscapes. It produces bright yellow, five-petalled flowers.

The white, leaf-like structure is called a bract, which is a modified leaf.

Thai Dragon Tree needs nutrients