The cucumber belongs to the same family as melons and squash, the Cucurbitaceae. They prefer warm soil conditions, so in regions with cold spring weather, the plants benefit from starting seed germination indoors. For best results start cucumber plants indoors during late March or April. Place seeds in the refrigerator for 48 hours prior to planting for optimum germination. Germination occurs seven to 10 days after planting. Once all danger of frost has passed the cucumber seedlings can be moved outdoors and transplanted into the garden.
Fill individual starter peat pots with starter potting soil. Cucumber seedlings develop large root systems so individual peat pots offer room for the plants' root systems and are easily transplanted into the garden.
Plant three seeds per peat pot container to ensure the success of at least one of the seeds germinating. If all the seeds germinate then thin the plants to one per pot.
Plant the seeds at a depth of no more than 1/2 inch in the soil. Place the peat pots in a window that offers full sunlight.
Water the cucumber seeds using lukewarm water. Keep the soil moist to the touch but not waterlogged.
Maintain a room temperature of 65 to 72 degrees Fahrenheit. There should never be a drastic temperature reduction during the night.