Asparagus crowns are the root system of a dormant asparagus plant, typically sold as bare-root material in the early spring. These crowns are one-year-old plants that have stored energy in their fleshy roots, ready to begin growth once planted. Temporary storage is often necessary if the crowns arrive before the planting site is prepared or while the soil remains too cold or saturated for immediate installation. The goal of this temporary holding period is to maintain the crown’s state of dormancy and prevent the roots from drying out or developing mold before they can be placed in their permanent garden bed.
Immediate Handling Upon Arrival
The moment the asparagus crowns arrive, carefully unpack them and perform a thorough visual inspection. Look for signs of physical damage, such as broken or severely bruised roots, which should be removed with clean shears. Also, check for indications of fungal growth or rot, which appear as soft, discolored spots on the crown or roots.
Next, assess the moisture level of the roots, as dehydration is a threat to dormant crowns. Healthy roots should be plump and pliable, not brittle or shriveled. If the crowns appear dry, rehydrate them by placing them in a shallow container of cool water for 15 to 30 minutes. Excessive soaking is not recommended, as it can encourage rot or stimulate premature sprouting, compromising the crown’s ability to establish itself.
Short-Term Storage Methods
Short-term storage, defined as up to two weeks, focuses on maintaining a cool, dark, and slightly humid environment to keep the crowns dormant. The ideal temperature range for this period is just above freezing, between 35°F and 40°F. A refrigerator crisper drawer or a cool, unheated cellar or garage can provide the necessary low-temperature conditions.
To prevent desiccation, the crowns should be nested in a material that holds moisture without becoming waterlogged. Slightly damp peat moss, coir, or shredded newspaper are excellent options for packing the roots. Place the packed crowns into a plastic bag or container left partially open to allow for minimal air exchange. This slight ventilation helps deter the development of mold or mildew, which thrive in stagnant, overly humid conditions.
Maintaining Crowns During Extended Delays
When planting must be postponed for longer than two weeks, the risks of desiccation, mold, and premature sprouting increase significantly. For extended holding periods, the temperature should be kept consistently cool, ideally between 33°F and 38°F, to enforce dormancy. The crowns should be monitored weekly to check for signs of drying out or the beginning of new growth.
An alternative method for longer delays, if the ground is workable, is “heeling in,” which involves temporarily burying the crowns outdoors. Dig a shallow trench in a protected, well-drained spot and lay the crowns side-by-side, covering the roots with loose soil. If outdoor planting is not feasible, keep the crowns in perforated plastic bags in the refrigerator, ensuring the packing material remains barely moist.