United Kingdom 
why are the leaves lace looking
3 Jul, 2010
Previous question
United Kingdom
why are the leaves lace looking
3 Jul, 2010
Previous question
With your question being so vague (no species, no variety, no photo, etc.) I'd hazzard a guess and say it is caused by leaf miners, larvae from a moth eating the leaf from the inside.
4 Jul, 2010