What are the best annuals for full sun gardens?

Published: April 19, 2025
Updated: April 19, 2025

Annuals that require full sun provide non-stop color when other plants wither. These tough flowers can take over six hours of direct sun per day. From zinnias both bright and hot, to portulaca that spills and cascades, they will take toughness and heat and turn a barren or harsh space into a colorful display. First, start with a soil test, as most require 6.0 to 7.0 for optimum pH.

Top Annuals for Full Sun Gardens
PlantZinniasSunlight Needs6+ hoursWater Requirements
Moderate
Color VarietiesRed, Orange, Pink, White
PlantLantanaSunlight Needs8+ hoursWater Requirements
Low
Color VarietiesMulticolor Clusters
PlantPortulacaSunlight Needs6+ hoursWater Requirements
Very Low
Color VarietiesPink, Yellow, Orange
PlantMarigoldsSunlight Needs6+ hoursWater Requirements
Low
Color VarietiesGold, Orange, Red

Soil Prep Basics

  • Test soil pH before planting, amend with lime if below 6.0
  • Mix 3" (7.6 cm) compost into heavy clay for drainage
  • Use gravel mulch for succulent annuals in rainy climates

Water Wisdom

  • Water zinnias deeply 1x weekly, avoid wetting foliage
  • Portulaca thrives on 1" (2.5 cm) water every 10 days
  • Use drip irrigation to prevent fungal issues in humidity

Create a plant design that has a thoughtful purpose. Pair spiky blue salvias with low, mounding marigolds for good contrast. A client was able to create a butterfly haven in their sloped yard just by planting these two combinations. For height, you can add some sunflowers as the seed will feed the birds, and stalks provide a trellis purpose for climbing beans.

Pollinator Magnets

  • Plant lantana near tomatoes to boost pollination
  • Group zinnias in clusters of 5+ for butterfly visibility
  • Add shallow water dishes with pebbles for bees

Pest Control

  • Border gardens with pest-repelling marigolds
  • Interplant basil to deter aphids naturally
  • Handpick hornworms at dawn for quick control

Welcome, experimentation into your garden. I learned the cooling effect of dusty miller after a failed petunia bed where its silvery leaves perked up the corners that got too hot. Don't keep your discoveries to yourself. Post a photo of your container combinations or designs that held up in extreme heat and tag the people who taught you, for feedback. Shared creativity is a respectable garden quality, both gritty and graceful.

Read the full article: Full Sun Annuals: Blooms That Thrive in Sunshine

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