The Cowboy Cactus is incredibly popular and is often the star of interior design blogs and social media. Instagram and Pinterest can’t get enough of the Euphorbia Better still, it will suit your busy modern lifestyle too - this columnar house plant needs virtually no maintenance at all. Officially, the Euphorbia Eritrea is not a cactus but a succulent. However, it looks so much more like a traditional cactus. Care Euphorbias are masters in survival. They can store lots of water so they can easily go without water for longer periods of time. When the temperatures are lower in winter, the Cowboy Cactus can easily go without water for 3 months. When the temperatures are low, it is better to keep the soil dry. If the plant is on a sunny location and/or above a heat source, it is recommended to water them once a month. Size The plants have a height of 50-60cm upon delivery, measured including the nursery pot. The plants are supplied in a nursery pot with a diameter of 17cm.