How Tall Does Cleome Grow. Plant the seeds as early as the ground can be worked in spring. However varieties that grow taller than 5 feet may need some support if they become too lanky especially if you plant them in a windy location.
Space plants 16 to 24 inches 40 to 60 cm apart creating flower beds with at least ten young plants. Drop about six seeds into each hole and cover with a quarter-inch of soil. Across 10 cm of sweetly fragrant pink flowers with fascinating long stamens that protrude out giving them a spider-like look.
Over the course of one summer cleomes can grow 3 to 6 feet tall with a spread of 2 feet.
However the fashion was to grow cleome plants in decorative pots rather than directly in the garden. Plants grow 4 feet tall and can branch out to 4 feet wide. Plant the seeds as early as the ground can be worked in spring. The unique spider-like blooms were a curiosity in Victorian times.