- Lifecycle: Biennials Annual - Hardiness: Hardy Annual - Sun: Full sun - USDS Zones: 7-10 - Season: Spring to summer - Seed to Bloom: 12 weeks" - Grow Sweet Sultan, Imperialis Mixture from fresh Amberboa moschata flower seeds. Sweet Sultan will produce tall stemmed plants with feathery blooms ranging in colors of pink, yellow, mauve white. This attractive plant grows to a mature height of around 24 to 36 inches tall and makes an excellent cut flower for floral arrangements bouquets. Sweet Sultan is not only beautiful, but also fragrant as well. The blooms will attract an array of beneficial insects including bumblebees, butterflies, hummingbirds and lady bugs. - Amberboa is grown as an annual flowering plant that will grow quickly, bloom heavily and later die with the first killing frost. Check out some of the other flowers we have to offer to create your own bouquet with several other cut flower varieties as well. - Sweet Sultan seeds should be stratified prior to sowing. This can be achieved by placing the packet of seeds in the fridge for about 1 week. After stratification, the seeds can be started either indoors, or directly outdoors. If started indoors, sow in peat pots, 6 to 8 weeks prior to the last frost, at a depth of 1/4? under topsoil. Transplant or direct sow outdoors when the weather is warm and all danger of frost has passed. - Amberboa will thrive in dry and moderate conditions. They will require an area of full sunlight to partial shade and do best in temperatures of at least 70F. The soil doesn?t need to be super rich, but just make sure that its well drained. For areas consisting of hard, compact soil, we recommend combining a light, fluffy compost to improve drainage. Water daily to keep the soil moist up until germination occurs. - Your seeds will begin to sprout within 7 to 14 days after sowing. The plants will grow to a mature height of roughly 24 to 36 inches tall and can be spaced roughly 12 to 18 inches apart from one another. Sweet Sultan will produce beautiful feathery blooms in a mixture of vibrant colors. Both colorful and fragrant, this mixture attracts an array of beneficial insects and is often used as a cut flower in floral arrangements.