03/09/2026
Zinnias can easily be seeded directly into the ground, but if you’re like me and can’t wait and want to get a head start, you can start them indoors - as long as you have a light source! A bright windowsill will not be enough.
Zinnias grow fast and they are sun lovers. If they don’t get enough light, they will be leggy and weak.
Just don’t start them too early! 2-3 weeks before planting outside is a good timeline to aim for.
The lights I’m using are 4 foot long LED Barrina shop lights from Amazon (I have no affiliation with this brand) but you can use any shop light or grow light with “daylight” colour light. The more lumens the better (brighter). Mine are 5000 to 5500 lumens.