- Name: Mexican Feather Grass - Other Common Names: Feather Grass / Pony Tails / Wind Whispers / Silky Thread Grass / Wiregrass / Needlegrass - Scientific Name: Stipa Tenuissima Syn. Nassella Tenuissima - Color: Bright Green Foliage / Pale Yellow - Silvery White Flowers / Tan Seed Heads - Plant Seeds: In Warm Soil - Bloom Time: June - Sept - Hardiness Zone: 6 - 10 (& Reseeds Itself) - Plant Height: 24 - 36" - Plant Spacing: 15 - 18" - Light Requirements: Sun - Soil & Water Preferences: Average - Quantity: 25 Seeds - Other: This Clumping Mounding Bunchgrass Is Native To North & South America. It Is Very Tolerant Of Heat, Drought, And Clay Soil. Feather Grass Is Deer Resistant & Can Be Naturalized, Grown In Rock Gardens Or Containers, Or As A Specimen Plant. It Is Very Ornamental, With Delicate Thread Or Hair-Like Leaves Look Like Feathers Blowing In The Breeze. The Fall Seed Heads Are Quite Showy Too!