Jim, they will do better if you push the end of the stem down in some potting soil and tamp the dirt down around the end of the cutting so there are no air pockets. Moisten the soil lightly and put then a large clear plastic bag over the entire pot. If too much moisture builds up inside the bag, open the bag for a minute to vent it. Make sure the "plastic tent" is not touching any part of the plant.
Cutting started in water often die when they are put in dirt. Water roots are different than roots started in dirt.
Keep the pot and bag out of the sun.
Just my 2 cents!
Cheers!