the height of the fence, the conductor you are laying and the height of the plant buildings will decide the level of protection.
The tape you are adding - where does the other end of it go to the LPS, and how is that earthed, how is the building frame (and so the plant buildings) earthed, and how is the wiring within the building earthed ?
Its  not as simple a question  as it looks.
Mike

mapj1 said:

Its  not as a question simple as it looks.

Seconded.

Assuming you're in the UK, a risk assessment and design in accordance with BS EN 62305 (series) should be / have been carried out. Often this is by a specialist consultant / contractor (depending on the life stage of the building), and you would be well advised to consult them.

For example they should be able to provide the specfiic separation distance between LPS conductors and other earthed metallic conductors (such as your plant) necessary to prevent flashover., even if you're "within a protected zone"... this can be further than you think.

Note that older buildings may have been designed be to a different standard, and these may need a different solution.

Thanks for the reply Jam.

I am in the UK & I have already done the risk assessment as per BS EN 62305. So, LPS level IV is required for this building.  

So... copper tape to protect plants.  Would the problem be slugs and snails attacking the plants?  That's what gardeners use copper tape for.

I  see there's a "Suggest as Helpful Answer" tickbox below this reply.  But I don't have a "Suggest as Unhelpful Answer" to tick instead.