Propagator Progress and a Challenge

 Here's the current state of play with the propagator:

There's Sungold, San Marzano, and Currant Tomatoes, Cucumber, Sweetcorn and the dreaded Celeriac. The Jalapeno Pepper and Kobocha Squash both failed. Not too impressed with the supplier. Their sweetcorn is looking good though.

Can you guess what this is?  

As a clue, there's a Jaws connection.