Question
-About how long are the roots in 2 weeks?  What does the plastic do?

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Followup To
Question -
I have trouble getting roots to grow from these cuttings. I put them in water for well over a month and see nothing but stubs that never turn to roots. I have had success on SOME cuttings but not all. What's the secret?
Answer -
Chris, some plants are susceptible to root rot.  The cuttings probably began developing roots but they never fully materialized due to rotting.

I seldom start seedlings in water.  Instead, I use a fertile potting soil.  I first dip the stems of the cuttings in a rooting compound.  You can purchase this at most garden centers.  I then place the cutting in the potting soil, and then cover the pot with a lightweight clear plastic.  After about two weeks, the cutting should take root.  I then remove the plastic and care for the cutting as you would for a new seedling.

I hope this helps.  Please write again if I can ever be of assistance.

Regards,

Mike

Answer
Chris, the roots are long enough when they take a firm hold with the soil. Many gardeners give the seedling a slight tug to ensure the roots are secure.  I do not believe in disturbing the roots of young seedlings for fear of inducing transplant shock, so I trust through my experience that most seedlings take root in about 10-15 days.

The plastic is used to retain moisture.  In effect, you are creating a mini greenhouse.  Just be sure the potting soil is thoroughly moist before setting the cutting.  The plastic will keep the soil at the correct moisture level and help induce rooting.

Good luck, and have a great day.

Mike