as much as they seems to be sprouting they may get up and walk themselves to the plant!...you might want to try and use a piece of white poster board slightly curved in half to get rid of the distracting corner lines and use a bounced flash to soften the shadows
Idea is captured well - though not the most aesthetically pleasing subject matter in the world! Did you know that potatoes are part of the deadly nightshade family and the green-ness of a potato indicates the level of deadly toxins? Those potatoes look like they are growing and will be pretty untasty (and poisonous)!
Quite a bit of white space in the frame that could be eliminated. Focus could be brought onto the potatoes by bringing them into the foregroundand have the box as a background element (currently all in the mid-ground). Your studio set-up is showing a distracting crack on the LHS. And your prop box is showing signs of wear - only relevant because this looks a bit like like a commercial prodiuct shoot, which we are used to seeing as perfect (might be an interesting idea to make this as "imperfect" as possible in a commercial style - those potatoes are nearly there...!)