How to Grow Calibrachoa Uno
Wikimedia Commons
Calibrachoa Uno
Calibrachoa × hybrida 'Uno'
flowerCalibrachoa Uno is a compact, mounding annual flower with small petunia-like blooms in vibrant colors. It produces masses of tiny flowers throughout the season and is ideal for containers, hanging baskets, and garden borders. The Uno series is bred specifically for uniform growth and prolific flowering with minimal deadheading required.
Looking for a specific variety?
When should you plant Calibrachoa Uno in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Calibrachoa Uno timeline · Pittsburgh, PA (Zone 6b)
-
Plant Calibrachoa Uno
Around Apr 17Near Pittsburgh's average last spring frost.
-
Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
-
First Calibrachoa Uno blooms
Around May 22≈ 35 days after planting
Sample dates for Pittsburgh, PA. Sign up to get exact Calibrachoa Uno dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Annual grown everywhere; perennial in zones 9-11
Sign up free to see if Calibrachoa Uno grows in your zone — and get a personalized planting timeline.
Get my Calibrachoa Uno timeline →Growth Stages
Seed Germination
7-14 daysTiny seeds germinating under lights. Requires light exposure and high humidity for success.
Do not cover seeds. Keep soil moist and warm (70-75°F). Provide 12-16 hours of light daily. Germination takes 7-14 days.
Seedling Development
2-3 weeksFirst true leaves appear; plant develops small root system in seed trays or cells.
Maintain consistent moisture. Thin if crowded. Keep humidity moderate to prevent damping off. Ensure bright light.
Vegetative Growth
3-4 weeksPlant develops bushy branching structure with multiple stems. Foliage is small, delicate, and light green.
Pinch back growing tips once or twice to encourage branching and fuller form. Harden off before transplanting outdoors. Begin fertilizing weekly at half strength.
Flowering
8-12 weeks (continuous from early summer to frost)Profusion of small (¾-1 inch), colorful flowers cover the entire plant. Flowers resemble tiny petunias.
Continue regular watering and weekly fertilizing. Deadheading is rarely necessary with Uno series. Pinch back leggy growth if needed in mid-summer.
Decline & End of Season
4-8 weeksFlowering slows as temperatures cool and days shorten in fall. Plant becomes straggly in frost.
Continue watering and feeding until first frost. In zones 9-11, cut back in fall and plant may regrow. In cooler zones, compost at season's end.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
-
Spray with insecticidal soap or neem oil every 7-10 days. Remove heavily infested leaves. Encourage beneficial insects.
-
Increase humidity by misting. Spray with water to dislodge. Use miticide or neem oil if severe. Avoid overhead watering that creates conditions favoring mites.
-
Spray with strong water jet or insecticidal soap. Use neem oil. Introduce ladybugs or lacewings.
-
Remove with alcohol-soaked cotton swab. Spray with insecticidal soap or neem oil weekly.
-
Improve air circulation. Spray with sulfur or baking soda solution. Reduce humidity and overhead watering.
Uses
Container Gardening & Baskets
HouseholdCalibrachoa Uno excels in hanging baskets, pots, and window boxes due to its compact, mounding habit and abundant flowers. A single plant fills a 10-inch basket with color by mid-summer. [source]
Garden Borders & Edging
HouseholdUse as a colorful border plant or mass planting in flower beds for dramatic color impact. Works well in rock gardens and raised beds. [source]
Pollinator Support
WildlifeSmall flowers attract bees, butterflies, and hummingbirds, providing nectar sources throughout summer and fall. [source]
Heat & Drought Tolerance Landscaping
HouseholdOnce established, Calibrachoa tolerates heat and some drought stress better than many annuals, making it suitable for challenging summer conditions. [source]
Cut Flower Arrangements
CraftSmall delicate stems and abundant tiny flowers can be used in miniature and cottage-style floral arrangements for fresh or dried applications. [source]
Harvest Tips
Not harvested; enjoyed as ornamental flowers. Deadhead spent blooms occasionally to encourage continuous flowering, though Uno series requires minimal deadheading. Cut stems for small indoor arrangements if desired.
Fun Facts
- 🌱 Calibrachoa is sometimes called 'Million Bells' because a mature plant can produce hundreds to thousands of small flowers in a season.
- 🌱 The Uno series was specifically developed by professional breeders to be more compact and floriferous than older Calibrachoa cultivars, with improved self-cleaning (flowers drop without deadheading).
- 🌱 Calibrachoa is native to South America and is actually more closely related to petunias than to other flowers, sharing the Solanaceae family.
Gardening Terms
New to gardening? Learn about terms used in this guide:
Join 30,000 gardeners planning their gardens with LizPlants.
Get your personalized Calibrachoa Uno planting timeline
Tell us your zip code and we'll calculate exactly when to start Calibrachoa Uno seeds, transplant seedlings, and harvest — based on your USDA zone and local frost dates. Includes calendar reminders and printable task lists. Free to start.
Get my Calibrachoa Uno timeline →