Fill seed trays with potting soil, leaving about an inch from the top, then sow lettuce, spinach, and radish seeds according to packet instructions, gently pressing them into the soil.

Lightly water the seeds and place the trays in a warm spot with indirect sunlight; if natural light is insufficient, use grow lights for 12-16 hours daily.

Maintain consistent moisture in the soil by watering gently every day, ensuring it remains damp but not waterlogged, which is crucial for germination and growth.

Observe seedlings emerging within 2-3 days and continue to provide adequate light and water; after 5 days, start feeding with a diluted liquid fertilizer every other day.

By day 7, your salad greens should be ready for harvest; carefully snip the outer leaves with scissors, allowing the inner leaves to continue growing for future harvests.

Wash the harvested greens thoroughly, then combine with optional additions like cherry tomatoes and cucumber, and serve with your favorite salad dressing for a fresh meal.