The later you drop off the gladioluses, the later they will bloom. If you plant bulbs in late March or early April, they will give color around mid-June. At the end of April, bulbs plant if it is necessary for them to blossom by the end of June. May gladioluses will give color in July, but June and July — near the end of September or even the beginning of October.
If you want to achieve early flowering, you can plant bulbs in the ground when freezing stops, air temperatures stop falling below zero and snow totally get away. The choice of date depends directly on the climate and weather patterns at a particular moment, however, it is generally possible to plant gladiolus for early flowering in early April. Note that not high enough air and soil temperatures, as well as relatively small amounts of sunlight, can negatively affect plants.
If you fear whether bulbs will survive not too favorable weather conditions, plant them when the soil warms up to a minimum of 10°C at a depth of 10cm. On average across Russia, the most appropriate time for planting gladiolus is considered to be late April or early May. Keep in mind that the root system development in the early days will be facilitated by high humidity and relatively low air temperature, so keep a close eye on changing weather conditions. For bulbs to be more resistant to disease, it is recommended for half an hour to leave them in a manganese solution prepared from 0.5 g of potassium permanganate and 1 liter of water, and then, without spawling, to plant in land.