[keano97]

How do you grow chives - i want to start them from seed.
How often do you harvest them - How high should they be left?? How longs should you wait before harvesting them??

[Sive]

You just cut what you need at any time, they just keep growing, you can also eat the flowers. When the flower colour fades, just cut the whole clump down to soil level and you get a second flush of leaves....and even some flowers.
I've never bothered with seed....I just buy one of those supermarket pots of chives, and split the clump into 4-6 smaller clumps and plant those out. You'll have them for ever....and they self seed too! Fantastic value.