Also let them get fresh air a few times a day for about 15 min or as soon as they start to wilt. Spray the inside of the dome after each airing out.

Quote Originally Posted by Ocotillo
I've gone from 4 rounds of clone hell, to 1 batch 50%, to 3 batches of 100% success. First, what NOT to do:
Do not spray directly onto the clones, never have big drops of water sitting on the leaves or growing center tips or it will cause mold. Don't have temps too high, over 90F will also make them rot and mold. Nothing should be wet and drippy except the clone dome lid. Don't pull them apart to "check progress". Don't use gel that's several months old as it goes bad. Don't allow your pets to eat the clones. Don't have dirty hands or work area and tools. I had fair luck with peat pucks and bad luck every time with Rockwool cubes.

What I did to change my life for the better:
Use good products like rapid rooters and clonex and PH'd water in a good spray bottle that can deliver a very fine mist. Sterilize tools and hands with peroxide. Yes, do your 45 angle cut underwater before dipping into jell, not powder. Scrape, peel or notch the bark as usual. Put a temp/humidity digital meter into your clone dome. a small 10-20 watt CFL is all the light you need at about 12" up. Open or twist your lid askew so as to let in air to regulate your humidity to 80-90% at first and around 70% after a few days. If/when it's hard to keep humidity up give each rabid rooter plug a spray or two or dab with a pipette dropper. Damp or moist, never wet and soggy. Ideal temp is around 75F-80F but under 90F will get the job done if you keep it all dry and clean. If I do get big water drops on the clones I'll dry each one with a Q-tip. Trim dead leaves after there is no more green on them. I went from 0% success with wet, hot, soggy rock wool to 50% success with extra care in peat pellets to 100% with same care in rabid rooters.

For extra credit I've also starting doing this special step I read somewhere:
About 3 days before taking your clones trim off the extra fan leaves and leaf tips from the shoots you'll be rooting. Leave them on the plant. After that they can recover some and have less stress when you clip and root them.

Yes, it is possible to clone any time including up to late flower. It's not ideal, but it's better than loosing the chain reaction "perpetual harvest". It's surely better to clone during veg, no question.