49-63 days. Plumosa seeds grow one of the most recognizable and efficient indoor favorites ever. Plumosa Asparagus seeds quickly mature into 18-24 inch tall laced and soft Ferny shrubs internationally favored to energize many offices and homes. Asparagus Fern is one of the easiest additions in the garden and is a perfect first grow for children or novice gardeners. Plumosa Asparagus Fern is one of the most popular greens used by florists and promises to add a delicate accent to any bouquet or seasonal arrangement.