Euphorbia palustris, or also known as the Marsh Euphorbia is an ideal plant for gardening because it has a different color for almost all of the seasons. It is a plant that has a very sticky sap

Plant sap

Sap is a fluid transported in xylem cells or phloem sieve tube elements of a plant. It transports water and nutrients throughout the plant....

 which one should beware of because it is poison

Poison

In the context of biology, poisons are substances that can cause disturbances to organisms, usually by chemical reaction or other activity on the molecular scale, when a sufficient quantity is absorbed by an organism....

ous and might cause an irritation. The Marsh Euphorbia starts blooming in early spring.