Posted: 17/03/2014 at 23:23
Loganberry, having an oil tank myself you do have to be careful what you do and how.
If it's a plastic tank, they do not last that long, they have a tendancy to split despite what the manufacturers say!
If it's metal, they can last 20 years with rust proofing.
You need access for safety and maintenance reasons, so a trellis screen is the best option. This needs to be placed 2-3 ft from the edge of the tank, to allow access.
You can grow whatever you like up the trellis. Oil is expensive, don't be tempted to cover it without taking safety into account, and the soil pollution from oil is impossible to to rectify.