Castor bean grows to a large size in a short time and makes a good temporary screen. The plants grow four to six feet tall and are spaced three to four feet apart. The largest plants develop from seed started early inside.
Castor bean likes a deep, rich soil, sheltered from winds.
The seeds are both attractive and poisonous so should be kept away from children. Its toxicity makes it a poor choice for use in home landscapes. The seed can be started outside in the garden. Plant them two to three inches apart and one and one half inches deep. Firm the soil over the seed which germinates in three to four weeks at 65 to 70 degrees.