Alyssum Flower Size. Most alyssum varieties have flowers that grow slightly spread-out from each other. This alpine or rock garden perennial forms a low shrubby mound of silvery-grey evergreen leaves bearing masses of fragrant soft-yellow flowers in mid to late spring.
Harden off seedlings by growing at 50-55F 10-13C night temperatures. Flowers arise from June to October and can be encouraged to rebloom by cutting back spent flowers. Most alyssum varieties have flowers that grow slightly spread-out from each other.
How to Grow Alyssum.
The plant itself is a sprawling variety that will only grow to about four inches tall. Alyssum - Key Growing Information. There are small pubescent oblong or obovate leaves at the base of heavily branching semi-woody shoots. 14102017 Description of alyssum flowers.