Yes growing marigolds with tomatoes is good companion planting. I'd put the seeds in the bag along with the tomatoes. For more info on companion planting go to http://www.companionplanting.net/

Ah yes, I thought that was okay. Once again, thank you. x

You should use French marigolds. African types don't have the same repellent factor. Especially for nematodes.

Wow, I didn't know that, I shall ahve to go and buy some.

Thank you...yes I had heard that somewhere before. x

Why would you want to keep nematodes away Wylie? We are usually adding them to keep slugs at bay... I thought it was pot marigolds that you used.

marigolds are excellent and a lovely flowering little plant to!

While there are different types of nematodes, there is the root-knot type that attack tomatoes. Since the question included tomatoes, this type of nematode (Meloidogyne spp.)causes reduced growth,wilting, yellowing and fewer tomatoes. Reference: www2.dpi.gov.au/horticulture/4855.html
The Ortho book of vegetables also claims marigolds will repel the Colorado potato beetle, but I don't think you have to worry about that (unless you see one).

Thanks Wylie I hadn't heard of that nematode before... I hope I never see a Colorado potato beetle!

Gosh that was an interesting conversation. What are nematodes?

Take a look at this website for a comprehensive answer

http://nematode.unl.edu/Wormgen.htm

Thanks Moon grower.. will do. x Have a great day.

You too