Genväxa is what a plant does when it does not get enough light; the stems grow thin and weak. It becomes genväxt.
Related words are genväg - 'shortcut' and the verb att gena - 'to take a shortcut'. It has nothing to do with genes, but is related to English against and German gegen, coming from a Germanic stem meaning 'straight' or 'against'.
The verb att växa, växte, växt means 'to grow', and the noun växt means 'plant'. (en växt, växten, växter, växterna)
These will hopefully grow better now when they are out in the greenhouse. No below-zero temperature is foreseen for the next few days, but there is still snow here and there, as you can see.