How to Water Euphorbia Triangularis

Plant Euphorbia triangularis in a clay pot that allows excess water to evaporate. Root rot is a common problem with euphorbia species. They do need water to live, but cannot have their roots in a soggy environment. Be certain there are adequate drainage holes and never let the plant sit in a saucer of water.

Cover the top 1/2 inch of the soil with gravel as an inorganic mulch to preserve the top layer of moisture. The surface will dry out too quickly with no covering and this may make you think the plant needs moisture when it doesn't. There are colored decorative gravels or you can use common pea gravel.

Water only when the plant is dry all the way down to the bottom of the container. Dip your finger into the drainage hole to check for dampness and a coolness. Either will indicate that you can wait another day or two.

Use a moisture meter to determine if it is time to water. The units take the guess work out of watering. There are many types of moisture meters from complicated to very simple. Some will tell you more than you need to know but the choice of model is your own. Put the sensor or wand all the way into the container. The gauge will tell you either by color or words when it is time to water. If it says "dry" or shows red, it is time to irrigate.

Apply the water at the base of the plant slowly. The soil will be dry and will not absorb moisture that is added too quickly. It will simply pour out the drainage holes. Gradually pour in small amounts to give the soil time to expand and grab the water. When it starts to drip out of the bottom the plant has had enough. Suspend watering entirely in the months of December through February.