In nature, mallow reproduces on its own by self-sowing in the fall. In August - September (and sometimes in July), the seeds are immediately scattered to the chosen place, mulched with a 2-3 cm layer of humus. And, having marked the place of sowing with a sign, they forget about it until spring. With winter sowing, seedlings will appear in the spring at the appointed time, when the soil warms up enough, and the plants will bloom in the same season.
In April - May, the soil is still quite moist after snow melting and from rains, so tender seedlings do not need watering. The earth around the leaves that appear can be carefully shed, trying not to get on the green parts (under the root), dissolved mineral fertilizers with a predominance of nitrogen. This will help to quickly increase the required amount of leaf mass. After a while, the plant will release a flowering stem. For the formation of more buds and abundant flowering from early July to late September, the stock rose may need phosphorus-potassium top dressing.
In spring, it is also permissible to sow seeds directly into open ground. The algorithm of actions here is the same as in autumn. Sowing is carried out around the end of May, when the risk of return frosts has passed. The day before, the seeds are soaked in a solution of phytohormones. This manipulation contributes to the early awakening of dormant embryos, activates the development of the root system, and increases immunity to adverse factors.
It often happens that not all seeds sown germinate. Therefore, many gardeners sow them with a margin, which is why the opposite situation arises - plantings are thickened. If there are too many seedlings, they grow chaotically, interfering with each other, weaker plants should be removed. Further, the mallow grows on its own, without outside help. In the case of spring sowing, the leaves develop in the first year, forming a round low rosette. And only for the next season, the stock rose will have a stem with flowers. A hardy stock rose can winter well without shelter. If the variety is delicate or snowless winters are predicted, the planting site can be covered with mulch.
In areas with a difficult climate and short summers, in order to admire the flowering, it is reasonable to grow heat-loving mallow through seedlings. Sowing seeds at home or in greenhouse conditions is carried out in February with additional lighting. March - April are considered more suitable dates due to increasing daylight hours. Early sowing dates allow plants to gain strength for a successful wintering even in the case of a cold autumn. Mallow has a powerful tap root. Due to the peculiarities of the structure of the root system, it is recommended to grow a flower without a pick and transplant it together with an earthen clod. As planting containers, it is better to take peat or cardboard cups with a larger volume so that the roots have enough space for full development until they are transplanted directly into the ground. Such containers, having previously broken out the bottom, are placed in the ground, as is, entirely, without disturbing the root system of the plant, even by transshipment. The prepared loose soil mixture is steamed or calcined. Adding perlite in a ratio of 1:3 will increase breathability. Seeds are pre-soaked in warm water with a growth stimulator diluted according to the instructions. Seeds swell from nutrient moisture, wake up and sprout faster. They are laid out in separate pots, deepening only 2-3 cm, covered with a film and placed under phytolamps. It remains to carefully monitor the moderate soil moisture and ambient temperature. It should be about 18-20 degrees.