· mexican feather grass (nassella tenuissima) has its pros and cons. Mexican feather grass is a beautiful, mounded, drought-tolerant ornamental grass. · discover comprehensive guidance for growing mexican feather grass. Plant indoors 4 - 6 weeks before the last frost. Read this guide to know how to maintain it and prevent it from spreading too much. Learn everything from planting to seasonal care and managing its growth effectively. · mexican feather grass can be a terrific ornamental grass to add to your garden if you want to soften up the look of your landscape. It is pretty as well as practical, but it should not be grown in some regions. It has needle-like flexible leaves that form dense, bright green clumps. · discover how to grow and care for mexican feather grass , a drought-tolerant ornamental plant with unique characteristics and benefits for landscaping and wildlife. It is, however, best to keep your hand on these grasses and avoid planting them in wild open spaces because they can disrupt native plants. · when properly cared for, mexican feather grass looks great in your garden. Whether you’ve recently planted a mexican feather grass or have an existing plant in your yard, here’s how to take care of it to keep it healthy and looking its best. The flowers are silky awns that appear in june and change from green to gold as they mature.