Sleeping Beneath the Surface: Caring for Dahlia Tubers Through Winter
- Debra Flaming
- Dec 23, 2025
- 2 min read
A Quiet Winter at Flaming Acres
December settles in gently here at Flaming Acres, and while the fields rest under gray skies and winter rain, life is still quietly unfolding beneath the surface. This season, our dahlias are sleeping—not in the ground, but tucked safely away for winter in a carefully monitored storage space. Overwintering tubers is always a season of watchfulness, and this year feels especially significant as we are trying a new storage method for the very first time.
Ventilated Storage and Climate Control
Our tubers are stored in a ventilated building where both temperature and humidity are closely controlled and monitored right from our phones. So far, conditions have remained steady, with an average temperature of 45°F and humidity holding around 85%—a range that helps prevent dehydration while discouraging rot.
Gentle Care with Vermiculite and Neem Oil
Each tuber is nestled in slightly damp vermiculite, creating a breathable cushion that holds moisture without smothering. Every two weeks, we gently mist the tubers using a sprayer filled with water mixed with Neem oil, a natural antifungal. This light moisture helps keep the tubers from drying out while protecting them during their long winter rest.
Watchfulness and Preparation
Still, even with all the systems in place, there’s a certain nervousness that comes with winter storage—especially when it’s your first year doing things a new way. We check the weather daily, knowing how quickly conditions can change here in Idaho. A serious cold snap is forecasted for Saturday, and we’re preparing to add low heat to ensure the tubers stay safely above freezing.
Mild Winter and Soil Health
This winter has been mild and rainy so far, which we’re grateful for. Rain ahead of deep freezes does wonderful things for the soil—soaking in moisture that will nourish the ground we’ll be planting into this spring. Even now, the earth is being prepared for what’s next.
Looking Ahead: Building a Cellar and Rethinking Layout
Behind the scenes, we’re also working through permits to build a proper cellar for future seasons. A cellar will offer even greater stability for overwintering tubers and provide peace of mind during Idaho’s sometimes harsh winters. It feels like an important step forward as we continue refining our practices and learning from last season’s challenges.
We’re also rethinking our planting layout for the coming year, with the goal of avoiding some of the issues that led to lower tuber production last season. Winter is teaching us—slowly and steadily—where to adjust, where to improve, and where to trust the process.
Hope for Spring
For now, the tubers sleep. And we watch. And we hope. Come spring, these quiet, wrinkled roots will wake once more—ready to grow, bloom, and tell their story again.
Sincerely,
Debra Flaming
Dahlia Tips
