As a support, the vision one is pretty handy and sucks completely to play against when the enemy plays a champ like Blitz who you definitely don't want to be out of place against.
The Honeyfruit can be pretty touch-and-go in terms of how it feels. The slow will definitely be a bad thing eventually, but it can help more than harm so far as I've seen.
The Blast Cone one is really crappy. There's no dodging how bad it can be on either side of it. You can accidentally (or intentionally) fling an ally to the enemies, you can misclick/misfire yourself in the wrong direction, even with the indicator, you or your opponent can be totally ready to last-hit and that lucky fruit happens to be nearby. It's not really play-friendly.
If I had a suggestion, it would be making the Blast Cone different. Like, imagine a plant that worked more like Bard's portal. How much better would that be? One-way passage through random terrain seems like it has the same knack for gameplay without the denial or random error in judgement. It'd be clearcut that you're using it to go one-way to wherever. And your opponent could follow. And best of all would be it'd be possible to use it as an initiator, the prime bonus of the kn