Preserving dahlia planting material until spring often becomes a serious problem for gardeners, especially owners of city apartments without cellars or basements. In such conditions, household refrigerator turns into the only hope for saving valuable varieties from death or drying out. However, simply putting the roots in the vegetable compartment is not enough - without strict control of humidity and temperature, they can rot or dry out in a couple of months.
The success of wintering directly depends on how well the tubers are carried out before storing them. Improperly treated or under-dried roots will begin to rot even at ideal temperatures, infecting healthy specimens with mold. That is why, before sending the crop into the cold, it is necessary to study in detail the requirements for the microclimate and packaging. preliminary preparation tubers before storing. Improperly treated or under-dried roots will begin to rot even at ideal temperatures, infecting healthy specimens with mold. That is why, before sending the crop into the cold, it is necessary to study in detail the requirements for the microclimate and packaging.
In this article we will analyze all stages of preparation, optimal packaging methods and rules for regular inspection planting material. Following the technology will allow you to keep up to 95% of the tubers in excellent condition until spring planting in the ground. Ignoring the basic rules of hygiene and temperature conditions can negate all the efforts spent on growing flowers in the summer.
Features of temperature and humidity
Dahlias, like many other tuberous crops, require stable conditions for winter dormancy. In their natural habitat, they overwinter in the soil, but in temperate climates, freezing of the soil is detrimental to root collar. The refrigerator is able to simulate conditions of deep rest if the temperature is maintained in the range from +3 to +5 degrees Celsius. At higher values, the buds may begin to grow ahead of time, which will deplete the plant.
However, low temperature is only half the success. A critically important parameter is air humidity. In a typical vegetable compartment of the refrigerator, the humidity often fluctuates, which leads either to the tubers shrinking due to dryness, or to the development of rot due to excess moisture. The ideal humidity level is about 60-70%, which allows the tubers not to lose turgor, but also not to germinate.
⚠️ Attention: Do not place dahlia tubers in close proximity to the back wall of the refrigerator or next to the evaporator. There, the temperature can drop below zero, which will lead to irreversible freezing tissues and death of planting material.
The stability of conditions is more important than the absolute values of indicators. Sharp temperature changes that occur when the door is frequently opened or warm foods are added provoke the formation of tubers on the surface. It is this moisture that is the ideal environment for the proliferation of pathogenic bacteria and fungi, so choose a place in the refrigerator where the temperature regime is most constant. condensation on the surface of the tubers. It is this moisture that is the ideal environment for the proliferation of pathogenic bacteria and fungi, so choose a place in the refrigerator where the temperature is most constant.
To control conditions, it is recommended to use simple household appliances. A hygrometer will help monitor the level of humidity, and a thermometer will make sure that the desired regime is actually maintained in the selected department. If the humidity drops below normal, the tubers will begin to lose weight and shrinkbecoming unsuitable for planting.
Preparation of tubers for winter storage
The quality of storage is 80% determined by the actions performed in the fall immediately after digging. The first stage is always a thorough but careful removal of the remaining soil. This should be done with your hands, trying not to damage the thin roots and root collar, since any mechanical damage is an open gate for infection. cleaning from the remains of the earth. This should be done with your hands, trying not to damage the thin roots and root collar, since any mechanical damage is an open gate for infection.
After cleaning, the tubers must be washed in water with the addition of a disinfectant. A pink solution of (potassium permanganate) or specialized fungicides such as “Maxim” or “Fundazol” has proven itself well. Soaking for 30 minutes allows you to destroy fungal spores that could get on the surface of the tubers during the digging process. potassium permanganate (potassium permanganate) pink or specialized fungicides such as Maxim or Fundazol. Soaking for 30 minutes allows you to destroy fungal spores that could get onto the surface of the tubers during the digging process.
The next critical stage is drying. Tubers must be completely dry before packaging. Remaining moisture in the axils of the stems or in the recesses of the roots is guaranteed to lead to rotting in the confined space of the refrigerator. They should be dried in a ventilated area at room temperature for several days, turning them over to evaporate moisture evenly.
☑️ Preparation checklist
If damaged or rotten areas are found on the tubers, they must be ruthlessly cut out with a sharp with a sterile knife to healthy tissue. The sections must be sprinkled charcoal or treated with brilliant green to create a protective barrier. Only after complete healing of the cuts (callus formation) are the tubers ready for packaging.
Choosing the optimal packaging method
Packaging performs a dual function: it should protect the tubers from drying out, but at the same time allow them to “breathe”. Using sealed plastic bags without perforations is one of the most common mistakes that leads to damping off. Air exchange is necessary to remove tuber respiration products and maintain the correct gas composition inside the package.
One of the most popular and effective methods is the use vermiculite or wet sand. The tubers are sprinkled with a slightly moistened substrate in a container or bag. Vermiculite perfectly regulates humidity, absorbing excess water and releasing it when it dries, creating an ideal microclimate around each specimen.
The method of wrapping it in paper packaging or newspaper is also widely used. The paper absorbs excess moisture well and prevents direct contact of tubers with each other, which reduces the risk of rot spreading. However, this method requires more frequent monitoring, since the paper can dry out too quickly, especially in conditions of active air circulation in the refrigerator.
| Packaging material | Pros | Cons | Recommended control |
|---|---|---|---|
| Vermiculite/Sand | Stable humidity, protection | Heavy weight, dirt | Once a month |
| Paper bags | Cheap, accessible | Risk of drying out | Once every 2 weeks |
| Cling film | Visibility state | Risk of condensation | Weekly |
| Waxing | Full protection from drying out | Cumbersome process | Not required |
Perfect for small collections waxing. The tubers are dipped in molten paraffin, which creates an airtight shell that completely blocks the evaporation of moisture. Such tubers can even be stored simply in a box at room temperature, but in the refrigerator they feel even more secure, although this method requires caution when removing paraffin in the spring.
The secret of paraffin
The paraffin should not be too hot, otherwise you can burn the tuber tissue. The optimal temperature is about 60 degrees. Dip the tubers quickly, allowing the paraffin to immediately harden, forming a thin, uniform crust.
Placing in the refrigerator and monitoring the condition
It is best to place packaged tubers in the lower compartment of the refrigerator, intended for vegetables and fruits. It is there that the temperature regime is most stable and close to the required values. It is important to ensure free circulation of air around the package, so do not overcrowd the compartment or place heavy objects on top of containers with dahlias.
Regular control is the key to successful wintering. At least once a month it is necessary to remove the tubers and carefully examine their condition. If you notice the appearance of mold, the affected areas must be immediately cleaned, treated with an antiseptic and the packaging material replaced. Ignoring the first signs of rot can lead to the loss of all planting material.
If signs are detected drying (wrinkling, loss of elasticity), the substrate or paper should be slightly moistened. You can use a spray bottle to spray the packaging material, but not the tubers themselves, so as not to provoke the growth of fungi. If vermiculite is used, it can be lightly sprinkled with water and mixed.
⚠️ Attention: If you notice that the buds on the tubers have begun to swell and pale sprouts appear, the storage temperature should be reduced. To do this, you can transfer the tubers to a colder area of the refrigerator or increase the flow of cold air, but without allowing freezing.
Particular attention should be paid to condensation. If water is constantly forming inside a bag or container, this is a signal that the moisture balance is imbalanced. In this case, the tubers need to be dried, replace the packaging with a more breathable one, or add more dry absorbent material, such as sawdust or sphagnum.
Storage problems and methods for solving them
Even if all the rules are followed, unforeseen situations may arise. One of the most common problems is the appearance of white bloom or fuzzy mold. This is a signal of high humidity and insufficient ventilation. There is only one solution: immediate drying, removing the affected parts and replacing the substrate with a dry one.
Sometimes tubers begin to germinate prematurely, forming long, pale and brittle shoots. This occurs due to the storage temperature being too high or the dormant period being disrupted. It is better to carefully handle such shoots removeas they will still die during planting, and the plant will lose strength. After removing the sprouts, the temperature should be lowered.
If the tubers become soft and watery, this is a sign of bacterial rot. It is almost impossible to save such specimens; they need to be isolated and disposed of away from healthy ones. To prevent the spread of infection, all remaining planting material must be re-processed fungicides and storage conditions reviewed.
In rare cases, tubers can be affected by rodents even in the refrigerator if mice get in there. For protection, you can use repellers or place packages in metal containers with tight-fitting lids. It is also effective to use strong-smelling herbs, such as wormwood or mint, laid out next to the tubers.
Preparation for spring planting
With the onset of spring, usually in March-April, the tubers are removed from the refrigerator to awaken. You cannot change the conditions suddenly - let the package sit at room temperature for several hours to avoid temperature shock. After this, the tubers are freed from packaging and substrate.
Before planting or germination, it is recommended to carry out an inspection. All dry, rotten or damaged parts are removed and the sections are processed. If the tubers have become very wrinkled over the winter, they can be soaked in water with the addition of a growth stimulator for several hours to restore turgor tissues.
Next, the tubers are laid out in the light for germination or immediately planted in pots with nutritious soil. It is important to provide warmth and moderate watering to start the growing season. Properly preserved tubers produce strong, healthy shoots that quickly grow after planting in open ground.
The quality of flowering in the new season directly depends on how well the tubers survived the winter period. Planting material stored in the refrigerator often blooms even earlier than that bought in a store, since you control the entire process and guarantee varietal purity.
Is it possible to store dahlias in a regular bag without holes?
No, in a sealed bag without air access the tubers quickly will suffocate and rot due to the accumulation of carbon dioxide and moisture. Be sure to make perforations or use breathable