Grape propagation

I have four different types of grapes and last year I took a couple clippings to start new plants. I didn’t have much success. I took cuttings and put them in a bucket with soil and then in a black plastic bag and put in cool spot. I opened them in spring and they had some leaves but only one took out of the  whole bunch. What did I do wrong or is there a better way? Don’t know varieties but they only grow small grapes.

If a grape vine is laying on the ground it will root.  Take advantage of this to propagate additional vines. It can be done by pinning a vine to the ground or soil in a container or wrapping a bag of soil around the vine. The new vine has the support of the existing system until it has resources to support its self. This happens by accident for me so I was able to send 8 foot vines to the Lab for the new arbor.

To root grape cuttings, I use the prunings from early spring. Cut them into sections with 2- 3 buds. Cut the bottom about 1/2 inch below a bud, and the top about 1/2 inch above a bud. Then I put them in a pot of sand. I set the pot in a saucer that will hold an inch or two of water. Then I water regularly until about August. Many will have rooted by then, and I transplant them into pots, or into the ground.

I have had good luck with grapes grown from seeds. I have Concord grapes, and found sprouts growing under the vines. Dug them up and replanted where I want them. 3 of four are very similar to the parent. One of them appears to have crossed with a wild grape. It is slightly smaller fruited than the parent Concord, but much larger than the local wild grapes, and rather bitter until it has frosted, like a wild grape. It's a good jam/juice grape. So all 4 are good, but one is not a great eating grape.

yeah i agree with hans, its super super easy to ground layer grapes.
bring one of the larger vines down to the ground, then dig little spots where it touches the ground, cover with some dirt, some bigger rocks if you have them. you can do multiple spots - so every few feet bury the spots where it curves downward...called "serpentine" ground layering.

I've had good luck using Joseph's method on some of the winter pruned bits. For my Concords, I just dipped the ends in rooting hormone powder and stuck them right into potting soil and even directly into a raised bed. I got around 2/3 surviving which is fine with me due to how easy it was.

The other sweeter, tastier seeded grape I had also took with this method, but at a lower survival rate, around 1/3. I tried doing the same method with green, new growth in August of this year since I knew I wanted more for this new place. Surprisingly, that had an even better rate for it. Almost all had set roots by this fall. I'm leaving them in the seedling tray until next year to see how they make it through the winter before prepping room for them.

I love this method of propagation since it uses the pruning "garbage" and is so low effort. I was already able to give a bunch of plants to a friend that wanted to start food gardening.  They are a great intro plant for people to start permaculture gardening since they are so easy and familiar. As soon as mine are big enough to need pruning, I hope to be making lots more for sharing!

Iam in 5b so I don’t have a lot of wiggle time  to do stuff ,just  wondering if best time to take  cuttings?

I was in 5b, when I did my trials. The first group I did in full winter, late Jan, I think. I forgot to do it again this winter so just clipped, dipped and stuffed a group into a raised bed in late March/early April. Both ways worked fine and had similar survival rates.
The green cuttings were taken early August. I took actively growing tips for those.