Will probably start feeding with nutes tomorrow, day 19. Topped on day 18 at the 3rd node, I'll be quad-lining and the first node just looked weak and uneven, so I'll be going with nodes 2 & 3 this time instead of nodes 1 & 2 like usual. This has been an incredibly vigorous plant from the moment the taproot popped out of the seed shell, and it hasn't slowed down a bit.