- 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!