Lavender (Lavandula angustifolia, Lavandula stoechas) is a herb / plant native to southern Europe so it prefers warm and sunny places and needs the soil to be well drained. It prefers alkaline soils, rich in calcium.
Although you can plant lavender using seeds, it is not the best way to start lavender. The seeds are slow to germinate and are very delicate. If you buy seeds in a packaging, you should make sure they are fresh. Otherwise they will not germinate. You can sow the seeds in spring or early autumn.
The simplest and safest way to grow lavender on your balcony is to plant a scion from a mature plant in the pot or window box.
Alternatively, you can buy a ready-made plant from a nursery and transplant it.
Lavender needs a little water.
To encourage lavender growth, you can cut off the growing tops. This way the plant will grow in width.
Greek names: Λεβάντα, αγριολεβάντα, λαμπρή, λαβαντή, χαμολίβανο, μυροφόρα, καραμπάσι, αβαγιανός.
For guides on growing more herbs in pots or window boxes in the city, you may also check: How to grow 16 herbs and other aromatic plants in pots and window boxes.