Yes..Canna Start is good stuff..albeit a bit pricey like the rest of their line. I had a couple of seedlings that had no starter leaves. When that happens, I usually lose them, but Canna Start helped them to survive until they began feeding from their roots.
When I switched my nutes to Megacrop (only switched from Canna due to the cost), I experimented with using a highly diluted mixture on a couple of seedlings. They did quite well too!
Canna is super nice warez. Just expensive for bottled water. Swore by it for years, but it's just not worth the expense to me now. Great on a smaller scale, though!