Storing dahlia tubers properly over the winter is crucial for a successful crop the following year. Many gardeners have their tried-and-true methods but plastic wrap offers a surprisingly easy alternative. This simple technique keeps tubers viable without the mess of traditional storage mediums. Read on to learn the benefits of storing dahlia tubers in plastic wrap and how to do it right.
Why Use Plastic Wrap for Dahlia Tubers?
Storing dahlia tubers in plastic wrap offers several advantages over traditional storage in peat moss, vermiculite, sawdust or other medium
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No storage medium required. Eliminates the cost, mess, and potential contamination of bulk mediums.
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Space efficient. Tubers can be stacked tightly without touching, maximizing storage space.
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Easy inspection. Individual tubers can be quickly located and inspected during storage.
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Minimal shriveling. The tubers stay firm and plump in the humid environment inside the plastic.
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Fewer losses. Without a medium to harbor fungi, tuber rot is reduced.
Plastic wrap storage can reduce tuber loss to only 3-6% over winter, versus higher loss seen in some traditional methods. It also keeps tubers viable for early spring planting.
Step-By-Step Guide to Storing in Plastic Wrap
Follow these simple steps for storing dahlia tubers in plastic wrap:
Dig and Divide the Tubers
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Dig tubers after the first frost, when stems are brown and shriveled.
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Carefully wash off soil and debris.
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Divide tuber clumps into individual tubers, retaining the stalks and eyes.
Apply a Protective Coating (Optional)
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For disease prevention, coat tubers with sulfur powder or dip in a mild bleach solution.
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Allow tubers to dry completely before wrapping.
Wrap Tubers Individually
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Cut sheets of plastic wrap ~20 inches long.
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Place one tuber on the wrap and roll tightly around it.
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Add more tubers, rolling wrap over each one.
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Keep tubers separated; do not allow contact.
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Fold over ends and seal with tape; label package.
Pack Tubers for Storage
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Pack wrapped tubers upright in boxes, crates, or bins.
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Store in a cool (40-45°F), dark place.
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Check periodically for any softening or mold.
Unwrap and Plant in Spring
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Unwrap tubers about 2-4 weeks before planting time.
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Check for viable eyes and discard any blind tubers.
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Plant outdoors after all danger of frost is past.
Helpful Tips for Plastic Wrap Dahlia Storage
Follow these tips to get the best results from plastic wrap tuber storage:
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Wrap tubers as soon as they are dry to avoid shrinkage.
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Experiment with fungicide levels to prevent eye damage.
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Allow air flow between stacked boxes or crates for ventilation.
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Inspect randomly early on to catch any unseen tuber rot.
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Unwrap early to allow time for eyes to emerge on slow-sprouting varieties.
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Rewrap or replant any tubers that show mold or decay during storage.
Frequently Asked Questions About Plastic Wrap Storage
Many gardeners new to this method have additional questions. Here are some commonly asked questions and answers:
Does plastic cause sweating or condensation on the tubers?
Condensation requires a significant temperature differential, which is unlikely in an insulated garage or other dahlia storage space. So plastic wrapped tubers generally do not suffer from excess sweat or moisture.
Can rot spread between tightly packed tubers?
Studies show rot fungi transmit slightly more easily in porous mediums like vermiculite than plastic. Rotted tubers tend to already have infections rather than spreading it when tightly wrapped.
Is it easier for tubers to dry out in plastic wrap?
In fact, the opposite is true. The humid microenvironment inside the plastic wrap keeps tubers plump and firm over an extended storage. The plastic prevents moisture loss.
Do eyes emerge earlier or slower in plastic wrap?
Tubers often begin sprouting sooner when stored in plastic, but some varieties are naturally slow to emerge regardless of storage method. Slow sprouters may need additional warm, moist conditions to produce eyes.
Can I reuse plastic wrap or combine fresh and stored tubers?
Sanitation is important, so use new plastic for freshly harvested tubers. Storing old and new together risks transmitting diseases.
The Benefits of Storing Dahlias in Plastic Wrap
For dahlia gardeners seeking an easy, space-saving way to store their precious tubers, plastic wrap offers a convenient alternative to traditional storage mediums. The moisture-retaining environment keeps tubers plump and healthy over the dormant season.
With fewer losses to rot and desiccation, gardeners can expect more of their tubers to sprout successfully come spring. And they’ll delight in unfolding each piece of plastic to reveal the promise of another season of vibrant dahlia blooms.
