>>782346Can you at least use the outside windowsill then? Window glass blocks light too.
The weather is also great for solar hardening off so they don't sunburn, should also help with/prevent/contain fungus gnats (for battling those you can get a small bottle of "Neudorff Stechmückenfrei" for a couple € and add like 1 drop to your watering can, this contains BTI bacillus and will work on the larvae so takes some time)
Sure you can get by for a while with pruning a little here and there, but I doubt they'll survive that forever.
If you really have to leave them on that spot, consider at least place a cardboard wrapped in alu foil behind them, did that with a rack over winter for my starters
