Growing Lettuce, Rocket Etc

[RocW]

I've decided to grow some salad leaves this year.  I've never done so before.  I thought of growing them in trays but I have no idea how deep the roots go down.  Has anyone any advice please?

 

[maggiebee]

Luckily, lettuce does have shallow roots, so you can get away with a smaller container than the average vegetable. Ideally, you want something that is a 3-gallon or larger or a minimum depth of 10-12 inches. And if you love your lettuce, please please ensure your container has drainage holes

This is from Google.

[Buenchico]

This might help:

[jourdain2]

I've grown them in shallow trays in the conservatory in Winter - unfortunately I hadn't reckoned on my cat using them as litter trays.......      I've also used those tomato bags, you can get lots in them and sow successively.