Their results in each task determine the ultimate winner.
The man who taught Mr Tatana all he knows, Patrick Malley, won the competition in 2014.
"I've had a huge amount both professionally and personally that's come out of this competition. Not only the kudos of winning the competition and being able to say that you're the Bay of Plenty Young Grower of the Year, but also just having the knowledge that you've been tested as much as you can in the horticulture industry by real experts gives you a lot of confidence to build on."
This is the first year the competition has teamed up with the Te Puke A&P show to provide a fun day for all the community.
"We used to have quite a bit of input from the horticultural side of things, and for the last few years there hasn't really been much, so this is awesome to get that side of things back on board."
The candidates will find out which of the six of them will progress to the national stage of the competition at a gala dinner on Wednesday.
In Mr Tatana's case, he's just hoping the apple doesn't fall far from the tree.
The national stage of the competition will be held in Christchurch on August 16-17.