Zinnia
Zinnia elegans
The first flower grown in space — NASA cultivated zinnias on the ISS in 2016 as a precursor experiment for growing food crops on long-duration missions.
How to care for zinnia
Direct-sow seeds after the last frost — zinnias resent transplanting and produce stronger plants from in-ground seeding. Water at the base, not overhead, to prevent powdery mildew on the foliage.
Garden uses & design ideas
Best garden use
Use it where you want fast seasonal color in containers, walkway edges, or gaps between slower permanent plants.
Pair it with
Tomato, Cucumber, Basil make easy companion choices because they share similar light, water, or visual texture needs.
Layout tip
Match it with full sun exposure, place it in a moderate-water bed where soil can stay evenly damp but not soggy, and check USDA zones annual everywhere before planting. Use the garden planner to test spacing around its mature size: 1-4 ft tall, 1-2 ft wide.
Gardener note — Double-check local invasive, edible, and toxicity guidance with your county extension office before planting around pets, children, or natural areas.
Companion plants
Zinnia grows well alongside these — similar light, water, and texture needs.
Common pests & problems
Where it grows best
Native to Mexico (Chihuahuan Desert); thrives in USDA hardiness zones annual everywhere.
Frequently asked about zinnia
What USDA zones does Zinnia grow in?+
Zinnia is hardy in USDA zones annual everywhere. Outside these zones, it can usually be grown indoors or as a seasonal annual.
How much sun does Zinnia need?+
Zinnia prefers full sun. Place it where it gets that light most of the day for best growth and flowering.
How often should I water Zinnia?+
Zinnia has moderate water needs. Keep soil consistently moist but not soggy. Direct-sow seeds after the last frost — zinnias resent transplanting and produce stronger plants from in-ground seeding. Water at the base, not overhead, to prevent powdery mildew on the foliage.
How big does Zinnia get?+
Zinnia reaches a mature size of 1-4 ft tall, 1-2 ft wide. Growth rate is fast, so plan spacing accordingly when planting.
What plants grow well with Zinnia?+
Zinnia pairs well with Tomato, Cucumber, Basil, Marigold, Cosmos. These companions share similar care requirements and don't compete aggressively for resources.
What pests affect Zinnia?+
Common Zinnia problems include powdery mildew; Japanese beetles; spider mites. Catching early signs in routine inspection prevents most damage.
When does Zinnia bloom?+
Zinnia blooms in summer to frost in every color except blue. Deadheading spent flowers (where applicable) often encourages a longer bloom window.
Design a garden with zinnia in minutes
Drag plants into a 3D space, walk through it, or upload a photo and let AI redesign it. Test spacing around its mature size before you plant.
More plants to design with
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AnnualNot sure what to plant where?
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