Preserving planting material of tropical plants in a city apartment often becomes a difficult task, especially when it comes to sensitive calla tubers. Low temperatures household appliances allow you to artificially create a dormant period necessary for resting the root system, but require strict adherence to technological nuances. Errors at the preparation stage or incorrect choice of place in the chamber can lead to rotting or premature awakening of the buds.
Many gardeners are afraid to use a refrigeration unit due to the risk of tissue frostbite, but it is the stable microclimate of this device that ensures better preservation than warm or damp window sills cellars Eukomis and other bulbous plants often overwinter together with callas, but each culture has its own characteristics. In this guide, we will look at proven methods that will allow you to get healthy planting material for the next season.
The key factor for success is understanding the biological rhythms of the plant. After flowering ends and the foliage withers, the tuber enters the deep sleep phase. At this moment metabolic processes the inside of it practically stops, which makes long-term storage without soil possible. The main thing is to prevent the scales from drying out and prevent the development of pathogenic microflora.
Preparation of tubers for winter storage
Before placing the bulb in the cold, it is necessary to carry out thorough preparation, which begins immediately after digging the plant out of open ground or removing it from pot. Cleaning from soil should be done as delicately as possible so as not to damage the dense skin of the tuber, since any scratch can become an entry point for infection. It is not recommended to use sharp tools or hard brushes.
The next critical step is disinfection. Even visually healthy specimens can carry fungal spores or rot bacteria. Treatment with a solution fungicide or a saturated solution of potassium permanganate allows you to destroy threats. After water procedures, the tubers must be dried at room temperature for several days until moisture completely disappears from the surface.
⚠️ Attention: Never put wet bulbs in the refrigerator. Residual moisture in conditions of low temperature and lack of ventilation is guaranteed to lead to the development of mold and softening of tissues in 2-3 weeks.
Final sorting helps to reject material that cannot be stored. You should carefully examine the bottom and side parts of the tuber for the presence of soft areas or dark spots. Healthy bulb It should be hard, elastic and have a uniform color. If you find small damage, you can carefully cut them out with a sterile knife and treat the cut with brilliant green or charcoal.
☑️ Checklist for preparing bulbs
Optimal temperature conditions and humidity
For successful wintering of callas, specific conditions are required that imitate their natural habitat during a period of drought. The optimal storage temperature varies from +3 to +7 degrees Celsius. At higher temperatures, for example, above +10 degrees, premature bud germination may begin, which will deplete nutrient reserves.
It is important to consider that different sections of the refrigerator compartment have different temperatures. The top shelves are usually warmer, while the area near the back wall or above the freezer (on No Frost models) may be colder. Use a household thermometer for control, since the readings of the standard regulator are often inaccurate. Mode stability More important than a perfect match with the numbers.
Air humidity also plays a role, although for dry storage it should not be high. Excessive humidity encourages mold growth, and too dry air causes tubers to shrink. The optimal level is considered to be 60-70%. If you notice that the bulbs are beginning to lose turgor, you can slightly moisten the substrate in which they lie, but not the bulb itself.
Choosing a location in the refrigerator
Choosing the right place inside the refrigerator is not just a matter of convenience, but the need to create a suitable microclimate. Traditionally, the coldest place is the bottom shelf above the vegetable drawers or the area against the back wall. This is where the temperature is most stable and meets storage requirements. However, direct contact with metal cooling elements should be avoided.
The refrigerator door is the least suitable place for overwintering bulbs. Due to the frequent opening of the door, the temperature here constantly fluctuates, which causes stress in the plant and can provoke awakening. In addition, the door compartments are often too warm for a full dormant period. Freshness zone (if your model has one) is also not suitable, since it maintains high humidity, which is dangerous for dry tubers.
If you store the bulbs in the vegetable compartment, make sure that they are not lie next to fruits that emit ethylene (apples, pears). Ethylene can accelerate aging and decay processes. It is better to allocate a separate shelf for flowers or use the top part of the vegetable box, fencing it off with cardboard.
Packaging methods and substrates
There are several proven packaging methods, each of which has its own advantages. The most common method is to use paper bags or newsprint. The paper allows the bulbs to “breathe”, providing the necessary gas exchange, and absorbs excess moisture. Tubers wrapped in paper can be placed in a cardboard box.
The second popular option is to use peat, sawdust or vermiculite. The bulbs are buried in a dry substrate, which is poured into a plastic container with holes for ventilation. This method better protects against drying out and sudden temperature changes. Sphagnum It is also often used as an antibacterial layer, but it must be dried first.
It is not recommended to use plastic bags, as they create a greenhouse effect and promote moisture condensation. If you do use bags, be sure to leave them open or make plenty of holes for air circulation. Sealed storage is only possible in vacuum packaging, but this requires special equipment.
| Packing method | Pros | Cons | Recommendation |
|---|---|---|---|
| Paper bag | Breathes, absorbs moisture | Can dry out | Ideal for dry rooms |
| Peat/Sawdust | Stable temperature | Risk of mold due to humidity | For long-term storage |
| Plastic (holes) | Protection from damage | Requires humidity control | For compact placement |
| Vacuum | Full insulation | Difficult to control condition | Only for experienced ones |
Can bulbs be stored in sand?
River sand can be used, but only if it is pre-calcined in the oven for disinfection. Sand holds the temperature well, but can scratch the delicate skin of the tubers, so it is better to mix it with peat.
Regular monitoring and maintenance
The storage process does not mean that you can forget about the bulbs until spring. Regular examination is a mandatory procedure that should be carried out every 2-3 weeks. This allows you to notice signs of rotting or drying out in time. If problematic specimens are detected, they are immediately removed from the general mass so that the infection does not spread to healthy ones.
During the inspection, pay attention to the smell. The appearance of an unpleasant, musty odor indicates the beginning of bacterial processes. If you notice soft spots, you need to carefully cut them out, treat the cut with an antiseptic and dry it. Prevention treatment is always more effective, so it is better to check supplies more often than to lose all the planting material.
Also monitor the condition of the packaging. If the paper becomes damp, it must be replaced with dry paper. If you are using a substrate, check to see if it has become lumpy due to moisture. In the middle of winter, you can lightly spray the substrate with water from a spray bottle if the bulbs begin to wrinkle, but this must be done very carefully.
⚠️ Attention: Do not store calla bulbs near foods that have a strong smell (sausages, cheeses, spices). The porous structure of tubers can absorb foreign aromas, which will negatively affect their taste (if we are talking about edible species) or simply create discomfort.
Typical mistakes and ways to eliminate them
One of the most common mistakes is digging up too early. Many gardeners rush to remove plants with the onset of the first cold weather, not allowing the tuber to accumulate enough nutrients. The leaves should turn completely yellow and lie down, giving energy to the roots. Premature dormancy leads to weak flowering in the next season.
Another common mistake is ignoring sorting. An attempt to save questionable bulbs “just in case” often leads to the loss of the entire harvest. The disease develops quickly in the confined space of a refrigerator. It is better to lose one tuber in the fall than to risk all your reserves.
The wrong temperature is also destructive. If the refrigerator is too cold (closer to 0 or minus), tissues can crystallize and die. If it's too warm, growth will begin. Using a thermometer helps avoid these extremes. Remember that conditions in different refrigerators may vary.
Preparation for planting after wintering
When the time comes to remove the bulbs from the refrigerator (usually March-April), do not rush to plant them in the ground right away. Sudden changes in conditions can be stressful. First, place them in a warm, bright place for a couple of days to acclimate. Then re-treat with fungicide.
Before planting, inspect the bottom and top. On a healthy bulb, swollen buds should be visible. If the tuber looks alive, but has shriveled over the winter, it can be soaked in a growth stimulator solution for several hours. This will help restore turgor and start the growing season.
Plant callas in light, nutritious soil, ensuring good drainage. During the first weeks, watering should be moderate so as not to cause rotting of the roots before active leaf growth begins. With proper storage and care, the plant will quickly grow and will delight you with abundant flowering.
What to do if the bulb has sprouted in the refrigerator?
If the sprouts are small (up to 1-2 cm), they can be carefully broken off and the bulb planted in a pot. If the shoots are long, the plant has already used up a lot of energy, but it can still be saved by planting it in the ground and providing good lighting.
Can calla lilies be stored in the freezer?
Absolutely not. Freezer temperatures (usually -18°C) are lethal to living bulb tissue. The water inside the cells will freeze, the ice crystals will rupture the cell walls, and after defrosting the onion will turn into mush. Storage is possible only in a refrigerator at above-zero temperatures.
How many months can calla bulbs be stored?
The optimal storage period is from 3 to 6 months. Typically, the bulbs are dug in September-October and stored until March-April. Longer storage is possible, but requires ideal conditions, since by spring the supply of nutrients is depleted, and the bulb may die.
Is it necessary to clean the bulbs of old scales before storage?
Deep cleaning is not required and is even harmful. You only need to carefully remove the remaining soil and dry roots. There is no need to remove the top covering scales; they protect the bulb from drying out and mechanical damage. If the scales come off on their own, they can be removed, but there is no need to forcibly rip them off.
Why do the bulbs shrink in the refrigerator?
Wrinkling occurs due to loss of moisture. This can happen if the air in the refrigerator is too dry or the packaging is not airtight. Light wrinkling is acceptable and reversible (the bulb will recover after planting), but severe dehydration can destroy the plant. Check the humidity of the substrate regularly.