Perennial Ornamental Grass problem
Name, age and/or size of plant - perenial grass one foot tall planted by previous homeowner When was the problem was first noted July 15th What part of the plant is affected?blade tips and some entire blades Have symptoms progressed or changed? a little progressed Growing conditions (full sun, part shade, shade, windy, salt spray, etc.) part shade Soil problems (compacted soil, construction activity, poor drainage) on a steep hill Pesticide and fertilizer applications none I haven't watered these plants, new homeowner here 4 weeks ago.
Lirope are prone to a couple of fungal problems, especially if they are watered overhead, watered too much, or mulch is applied right up to the base of the plant. (Always keep mulch back a few inches from the base of all trees, shrubs and other plants--it encourages disease and insect problems.)
We can't say for sure from the photos whether the symptoms are of anthracnose or crown rot. Please read through the following Extension page and look at the photos: http://www.clemson.edu/extension/hgic/plants/landscape/groundcovers/hgic1108.html
Be sure to cut these back in late winter-very early spring and remove all infected plant material so spores don't get on next year's clear new foliage.