Product Field NotesCompanion Plants
Frosty Blue Whale's Tongue Agave: A Sculptural Summer Pot
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Frosty Blue whale's tongue agave forms a single, symmetrical rosette of short, very broad, cupped leaves in powdery gray-blue with a turquoise cast. Each leaf ends in a steel-gray spine, the edges carry small even teeth, and faint imprints from neighboring leaves decorate the surfaces like a pressed pattern.
It is one of the most cold-tolerant agaves, handling temperatures down to about 5°F, but a Michigan winter is colder and much wetter than that. In the Great Lakes region it is a container plant that spends summer outside near the lavender.
Frosty Blue at a glance
| Trait | What to expect |
|---|---|
| Botanical name | Agave ovatifolia 'Frosty Blue' |
| Foliage | Powdery gray-blue with a turquoise cast, frosted finish |
| Size in the ground | 2 to 3 feet tall, 3 to 6 feet wide |
| Habit | Single, broad, open rosette |
| Flowers | Greenish yellow spire, once, after many years |
| Hardiness | USDA zones 8 to 10 |
| Light | Full sun |
| Deer | Resistant |
Using it with lavender
Agave and lavender agree on the essentials: full sun, lean soil and drainage that never lets water sit. Set a pot of Frosty Blue on a gravel patio, at the end of a lavender row or by a sunny step. Its blue-gray rosette echoes the silver in lavender foliage, while its bold, sculptural shape is the opposite of lavender's soft, airy spikes. One good pot can make a whole bed look designed. Use the Companion Plant Planner to see where a focal point would land.
Potting and summer care
- Container: a heavy pot with a drainage hole, filled with cactus mix or a gritty blend.
- Water: soak thoroughly, then wait until the mix is completely dry.
- Hardening off: introduce spring sun gradually over a week or so, or the leaves can sunburn after a winter indoors.
- Growth: it grows relatively quickly for an agave, so plan to pot up as the rosette widens.
Winter indoors
Before frost, move the pot into a bright, cool window or another frost-free space and keep it on the dry side. Cool weather combined with wet soil is what invites rot. Check the leaf bases for mealybugs and scale while it is inside, and use the Frost Date Estimator to time its trips in and out.
Safety and the long view
Those spines are sharp and agave sap can irritate skin, so wear gloves and place the pot away from busy paths and small children. It is ornamental and not for eating. After many years, a mature rosette sends up a tall spire of greenish yellow flowers and then dies. In a pot in a cold climate, that moment is a long way off.
Frequently asked questions
If it survives 5°F, why bring it in?
Cold alone is not the main problem. Long, wet, freezing winters rot agave roots, and Michigan winters often go well below 5°F.
How is it offered?
As a full 72-cell plug tray of young starters, suited to growers and container gardeners potting up many plants. See the product page for current availability.
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