Vertical or horizontal battens for attaching planters to shed wall?

[Bobafetting]

Hi everyone. Long time lurker who has benefitted massively from your collective knowledge. Thanks!

I’ve made 3 planter ‘troughs’ (900mm wide) from old scaffold, and want to attach them to my shed. What’s best: 2 x vertical battens fixed through the exterior cladding into the vertical studs of the shed (650mm spacing) and planter screwed to those, or 6x horizontal battens (2 per planter) spanning the studs, please? Does it even matter?

For ref, when I say ‘studs’ they are 30mmx15mm so not super strong/deep, but it’s shiplapped externally and 13mm OSB lined internally so it’s very stiff.

Thanks loads for your help.

Edit: my reasoning for using battens at all is to keep the planter timbers away from direct/permanent contact with the shed.

 

[big-all]

how heavy are the planters??
go inside to the area you are thinking about attaching to and push hard and see how the shed reacts as a heavy hanging load will pull continuously in that direction

 

[Dork Lard]

I've done similar this year & I chose vertical as it's more load sympathetic to the structure of the shed & rainwater won't be sitting on those horizontal battens.

 

[Bobafetting]

how heavy are the planters??
go inside to the area you are thinking about attaching to and push hard and see how the shed reacts as a heavy hanging load will pull continuously in that direction

They’re about 8-10kg each. There’s no bow in the structure if I pressure it

 

[Bobafetting]

I've done similar this year & I chose vertical as it's more load sympathetic to the structure of the shed & rainwater won't be sitting on those horizontal battens.

This is really useful, thank you. I was struggling to visualise the better use of load using my fading memory of school physics