Guardian Blue Delphinium

Delphinium elatum 'Guardian Blue'

Spikes of double, bright blue flowers atop strong stems are excellent for cutting and emerge from the mounding clumps of deeply lobed foliage. A superb specimen towards the rear of a perennial border.
There are very few rules in gardening, but perhaps the most important one is to work within your zone. Choosing plants that grow and thrive in your particular climate is the very first step toward having a beautiful garden . Learn More

Your climate might be too cold for this plant:


Full sun, Partial sun

Needs regular watering - weekly, or more often in extreme heat.

We no longer grow this plant

This page is for reference only. If you are looking for a plant to purchase, please use our Plant Finder to discover the perfect plant for your garden.

Set Zip to See Prices
More Information
Botanical Pronunciationdel-FIN-ee-um uh-LAY-tum
Average Size at MaturityFast growing stems 4 to 6 ft. tall.
Bloom TimeSummer
Design IdeasA highbrow perennial rooted in the traditional cottage garden. It belongs in every romantic composition, particularly country gardens. Indispensable to highbrow English perennial borders. Incredible massed into large landscapes. Demanding little surface area while offering tall staffs of color, this plant is a problem solver in spatially challenging urban gardens. Excellent in naturalistic plantings around edges of woodlands and meadows as a quasi-wildflower. Charming in red clay pots and other decorative containers on porch, patio, balcony and roof garden. A cutting garden essential.
Deciduous/ EvergreenHerbaceous
Flower AttributeFlowers for Cutting, Showy Flowers
Flower ColorBlue
Foliage ColorGreen
Garden StyleAsian/Zen, Contemporary
Growth RateFast
Landscape UseBorder, Erosion Control, Hedge, Woodland Garden, Cutting Garden
Light NeedsFull sun, Partial sun
Soil NeedsFlower & Rose Food
Special FeatureImproved Pest and Disease Resistance
Water NeedsModerate
Watering NeedsNeeds regular watering - weekly, or more often in extreme heat.

Follow a regular watering schedule during the first growing season to establish a deep, extensive root system. Remove old flowers to prolong flowering. Cut back to the ground at the end of the season.

This Plant's Growing Zones: 4-7

Your USDA Cold Hardiness Zone:

Your climate may be too cold for this plant