Leaves of seedlings that have turned pale or yellowed at the edges indicate a lack of strength for growth. Thin stems and a limp appearance indicate that the roots are cramped or cold. Without timely assistance, it will be difficult for plants to recover after transplantation.
Most often the reason is simple: the window sill is cold, there is not enough light or watering is too abundant. You can correct the situation in just a couple of evenings.
To begin, move the pots away from the cold glass and place a board or folded towel under them. Let the soil dry out a little; cucumbers do not like a “swamp” at the roots.
Now feed the seedlings. Dilute a teaspoon of urea in a liter of warm water and gently pour it under the root. Nitrogen will quickly return the leaves to a rich green color and the stems will become denser. If you do not want to use mineral fertilizers, an infusion of ash is suitable: a tablespoon per liter of water, leave for a day and water.
After 5 or 7 days, repeat feeding. This will consolidate the result and help the plants survive the move to the garden bed more easily.
For prevention, add additional light in the morning and evening so that the daylight hours are 10–12 hours. Make sure the temperature does not drop below 20 degrees and do not place pots too close to each other.
If you start acting at the first sign, the seedlings will quickly grow. You will try your first crispy cucumbers at the beginning of summer.
