Flowers

Growing flowers in Central Texas, particularly zinnias, cosmos, and English roses have worked well for us, requires attention to heat, soil, water, and timing. Central Texas has a hot, dry climate with alkaline soil, so plant selection and care are important.

Here’s how to grow zinnias, cosmos, and English roses successfully. Marigolds and other flowers can also be grown similarly.

Zinnias and Cosmos in Central Texas

Zinnias and cosmos are heat-tolerant annuals that thrive in Texas summers.

✅ Best Time to Plant:

  • Late March to early April (after last frost)
  • You can also plant a second round in July for fall blooms

🌱 Soil & Location:

  • Full sun (6–8+ hours/day)
  • Well-drained soil; amend with compost if needed
  • Avoid overhead watering to prevent powdery mildew

🚿 Watering:

  • Water at the base to avoid fungus
  • Water deeply but allow the soil to dry between waterings

✂️ Maintenance:

  • Deadhead (remove spent flowers) to encourage more blooms
  • Mulch to reduce weeds and retain moisture

🌼 Varieties for Texas:

  • 'Polar Bear' and "Purple Prince" are 2 of my favorites, seeds purchased at Wildseed Farms in Fredericksburg
  • ‘Profusion’ series (compact, mildew-resistant)
  • ‘Benary’s Giant’ (tall, great for cutting)

🌹 English Roses in Central Texas

English roses (e.g., David Austin varieties) are beautiful but can be challenging in the Texas heat unless carefully chosen and cared for.

✅ Best Time to Plant:

  • Fall (October–November) is ideal
  • Can also plant in early spring (February–March)

🌱 Soil & Location:

  • Morning sun with afternoon shade (especially in summer)
  • Raised beds or amended soil for drainage
  • Mix in compost and expanded shale to improve drainage

🚿 Watering:

  • Deep watering 2–3x per week in summer
  • Avoid wetting foliage

✂️ Maintenance:

  • Prune in late winter (mid-February)
  • Fertilize regularly: Start in spring and stop by August
  • Watch for pests like spider mites and aphids

🌸 Best Varieties for Central Texas:

Choose heat-tolerant English roses like:

  • ‘Olivia Rose Austin’
  • ‘Lady of Shalott’
  • ‘The Alnwick Rose’
  • 'Petite White'
  • ‘Molineux’
    These are known to handle heat better than older varieties.

🐝 Extra Tips for Both:

  • Use mulch (2–3 inches of bark or straw) to cool the soil
  • Use organic fertilizers to avoid salt buildup
  • Plant native companion flowers (like salvia or black-eyed susans) for pollinator support