Lemon, orange, grapefruit, and limes: all of these belong to the genus Citrus that have a wonderful and rich aroma almost all year round. The basic thing for growing tropical fruit is that the seeds for planting must be fresh. Planting itself is actually quite simple: rinse the seeds with water and plant them either in damp garden soil, peat, river sand, or in a special soil for citrus. You should put every seed in a separate pot or cup.
In addition, make sure that your seedlings get enough natural light, but also protect them from the midday sun and dry air. Note that winter temperatures, 53 — 60°F (12-16 °C), will be fine for your citrus trees.