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!