bonfire

Hi

I hope someone can help, ive just taken over an allotment and I would like to know if you can grow plants where a bonfire used to be? Will I need to add manure to the soil to improve it or can I just Rotavate over the patch and start using it

Many thanks 

The bonfire ash won't be a problem but bear in mind that any humus in the soil will have been burnt to ash down to a fair depth so the water retaining capability will be reduced and very little in the way of soil organisms will be present.

If you can I would swap some of the soil from there with some from elsewhere on the plotand mix it up and add lots of organic matter.