Two alternatives to grass; 5 Lippia nodiflora and 5 Achillea crithmifolia.

Achillea crithmifolia and Lippia nodiflora are easily cultivated in full sun (or partial shade in hot and dry climates), in well-prepared, drained, and loosened soil to facilitate their establishment. Achillea can withstand temperatures as low as -15°C (5°F), while Lippia nodiflora can tolerate temperatures around -12°C (10.4°F). They adapt perfectly to drained limestone or clay soils, even when dry in summer. In dry regions, watering every 15 days is sufficient to prevent the foliage of Achillea from drying out, while Lippia nodiflora requires no watering at all. Elsewhere, the plants can manage on their own. They are not very demanding regarding soil type, but they will be more floriferous and grow faster in slightly moist soil. It should be noted that these plants are perfectly resistant to water shortage; they simply go dormant during drought but will vigorously regrow once the rains return. Careful weeding is necessary during the first year until complete coverage is achieved. Afterwards, manual weeding should be done 2 to 3 times a year. Occasional mowing can replace manual weeding on large areas.