5000 Cleome Seeds - Mixed White, Pink, Purple - Spider Plantss - Nectar Flower for Monarch Butterflies 5000 Cleome Seeds - Mixed White, Pink, Purple - 3-5 Feet Tall - Spider Plant Good cutting flower. Nectar Flower for Monarch Butterflies. These seeds can be Cold Stratified (see Product Description below). They grow best in full sun; seeds will germinate in 8 to 12 days if temperatures are 70 to 80F. Seeds should be planted 1/8th inch deep and left uncovered. Space 3 inches between seeds, and space 18 inches between rows. Thin to 18 to 24 inches apart when plants are 3 inches tall. Spring and Summer - Cleome seeds may be started indoors or outdoors. They grow best in full sun; seeds will germinate in 8 to 12 days if temperatures are 70 to 80F. Marde Ross & Company specializes in flowering bulbs and peonies and has been a licensed California Nursery since 1985