It's a good question, actually. I have nursed a single clone for 2 weeks as I waited for roots to show up. When I went to pick up
the cup the clone was in my hand slipped and I brushed the back of my hand against my clone. Sucker did a TIMBER -- falling
over flat. If I would have known how to check clones better I would not have wasted all that time hoping for a doomed clone.
Now, if a clone has not rooted by day 7 I very gently grasp the clone stem and slowly exert upward pressure. As soon as O
feel any resistance I stop, figuring there are roots growing through the pellet and just haven't grown out yet. But sometimes
the whole clone will lift right out of the pellet with no resistance. NOTE: clones that don't even start to root for a week are not necessarily doomed.
I've had maybe 50/50 luck by re-doing the non-rooted clone. I make another bevel cut maybe 1/2 to 3/4 inch above the first cut.
Dip in Rootex and place in a new pellet.
Good luck, BigSteve.