- You Will Get 20 Seeds Of Feather Tree Fern Of The Desert Feather Bush Lysiloma Thornberi Shrub Seeds. - Description: - Name: Feather Tree. - Other Common Names: Feather Bush / Fern Of The Desert. - Scientific Name: Lysiloma Thornberi Syn. Lysiloma Microphylla Thornberi / Lysiloma Watsonii. - Color: Creamy White Flowers / Brown Seed Pods. - Plant Seeds: Outdoors After Frost / Indoors Weeks Before Last Frost. - Bloom Time: Spring. - Hardiness Zone: 9 – 11. - Plant Height: 12 - 15'. - Plant Spacing: 12 - 15'. - Light Requirements: Sun. - Soil & Water Preferences: Average – Dry.