Troubleshooting Brown Fronds on Newly Planted Mexican Fan Palms

Three 7-foot Mexican Fan Palms planted in full sun in Scottsdale, AZ, show brown, dry fronds after 3 weeks with watering every other day. Expert Darlene references standard care: well-drained alkaline soil (pH >7), graft union above soil, deep watering via soaker hose but let surface dry between waterings, fertilize after first year, prune annually. She suspects overwatering—wait until top 2–3 inches dry. Also check soil pH and ensure graft union isn't buried.