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.

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.

That's what the 'vote down' arrow is for Simon... 

I'll try and simplify an answer, but you've got more work to do to check the items mentioned.  

Assuming

1.) the copper tap is part of the air termination network and is connected to the down conductors and earthing electrodes using equipent of suitable dimensions and a suitable spacing 

and

2.)The metalic screen is of adequate dimensions and is bonded to the tape and forms part of the air termination network.

and

3.) The height of the enclosure relative to the plant provides protection from a direct strike when assessed using one of the three methods in BS EN 62305

and

3.)The plant separation distance to the screen is adequate when assessed in accordance with BS 62305 to prevent dangerous sparking 

Then the answer is no they don't need to be bonded to the LPS.    If the assumptions are not true then they may either need to be bonded to the LPS or additional lightning protection may be needed to protect them.