|Are there any special varieties or instructions for growing Hollyhocks or Hydrangeas in deep south Texas?
I'd recommend growing the bigleaf hydrangea (Hydrangea macrophylla) in south Texas. It grows to 3-6 feet tall and does best in the deep south planted in a part shade location. The plant flowers in June/July and the flower color depends on the soil pH. Acid soils produce blue flowers while alkaline soils, pink flowers. Check local nurseries for the best cultivars. Hollyhocks normally like cool temperatures where they grow as biennials. They should grow in a protected spot in your garden, but be sure to give them plenty of moisture and perhaps shade from the hot afternoon summer sun. Any varieties that grow locally should be fine for your garden.