I'm a newbie to product photography, trying to learn more as part of my job. We're doing a product photoshoot of plant collections inside a polytunnel (a bit like the example below). 

[![Plants in polytunnel][1]][1]

Because of the translucent roof, the space is filled with a diffuse light. 

Here is an example of the type of shots we are looking to do, as well as shots against a backdrop.  

[![Plant on clean background][2]][2]

My question is: what lighting set up would you recommend to take the best photographs of these products given the uncontrollable light from the roof?

What I've tried / considered:
- Blocking out the ambient light with a dark box or moving to other space. Unfortunately the products aren't that mobile and are fairly large, so easier if we can shoot in situ as-is
- We have budget to invest in two softbox lights, backdrop and reflectors, so keen to know what best setup might be with these in combination with the camera


Thanks!


  [1]: https://i.sstatic.net/AJtYQ.jpg
  [2]: https://i.sstatic.net/0SHcu.jpg