On Thu, 31 Dec 2009 16:16:36 +0000, K wrote:

lloyd writes

What's that in this context, and how do you know you have it? You're
scaring me now maybe I should stick to tins!

Only things which will affect the tomato's growth, not things which are
dangerous to you!

If you're getting good crops of tomatoes, there's nothing to worry
about.

Phew, I'll put the tin opener away then.