Windowsill herbs

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I have a good outdoor herb garden with all the hardy herbs I use regularly. Rosemary, mint, sage, thyme, oregano, fennel, bay.

Other things I like to use are coriander, basil, curly and flat leaf parsely.

I've had some success growing basil from seed on the kitchen windowsill, but struggle to keep succession. I have very mixed results with germinating parsely, and coriander seems to go to seed before producing much leaf.

What am I doing wrong? What are the optimum sized pots? Are the pretty sets sold as a windowsill herb garden too small? Any good recommendations?

I am 100% no expert but I’ve had great success with basil, coriander, curly parsley and chives from supermarket “growing” packs, using these pots that I top up with water every few days https://amzn.eu/d/0ikhm9Tn

Isn't parsley one of those with a germination inhibitor, so needs soaking? I find Giant of Napoli gives a good big plant but it takes a fair few seeds to get a couple of good plants to see me through winter

Coriander likes spring and autumn, will run to seed when it gets too hot. So why is Indian food full of it?!

Basil: are you pinching out? It needs to branch. And some say water from below in a big saucer. Mine's never great; I don't think it gets enough light in my kitchen.