I live in San Antonio and I have great success with purslane...however it seems to be exhausted. There are no more flowers and the leaves are starting to loose their color. My question is this, should I cut them back?
Plant purslane in full sun and well-drained soil. If you are growing purslane in a container or basket use a commercial potting soil mix. Feed with a little slow-release granular fertilizer at planting time, but after that additional feeding is not necessary. Water whenever the soil feels dry to the touch, but don't overdo it. Purslane would rather be a bit dry than flooded.
You can pinch back the plant to create a bushier plant.