Hi! with around 12 inches of annual rainfall, this is considered a dry climate, so even though your plant selection looks drought-tolerant, you’ll still want supplemental irrigation especially to help everything establish and stay healthy long-term. A drip irrigation system would be the best fit here since it delivers water directly to the roots, minimizes evaporation, and works really well with succulents and xeriscape-style planting like this. You could also group plants by water needs into zones to make it more efficient and avoid overwatering certain areas.
