Your website indicates most varieties of English hawthorn are thorny, but implies there are some that are not.
We don't recommend vendors but you can inquire at your local nurseries or do an online search for reputable nurseries that ship.
https://www.gardeningknowhow.com/ornamental/trees/hawthorn/thornless-cockspur-hawthorns.htm
two years ago they were full of berries - lat year nothing. I don't remember if they bloomed. Already this year they have leaves but have not bloomed yet.
They should be starting to bloom very soon! Usually, it is April through June for most varieties. Some flower first, and some flower and leaf out at the same time.
Trees are often grafted onto a hardier rootstalk to improve the winter hardiness of a plant, for one reason. Rootstalks in themselves are not usually a tree you would want. That's why it's important to remove suckers, so they don't take over the desirable top of the tree.
Hawthornes are often used as a rootstalk for fruit trees. Here is an article you might enjoy:
https://www.gardeningknowhow.com/ornamental/trees/hawthorn/grafting-a-mayhaw-tree.htm
https://www.gardeningknowhow.com/ornamental/trees/hawthorn/thornless-cockspur-hawthorns.htm
It's been in a sunny part of my lawn for two years & at best it's only a foot and a half . I live in southeastern Penna . Any Suggestions Thanks
Since it is in the lawn, be sure to remove grass around it a few feet to protect it from mowers, weed eaters, and lawn pesticides. Mulch it well with a hardwood mulch. Hawthornes need to be well watered until established, and even then, need moderate water. That may be what it is lacking. They also need well-draining soil.
Here are its care tips below.
https://www.gardeningknowhow.com/ornamental/trees/hawthorn/washington-hawthorn-care.htm
I've had my hawthorn for 5 years. Two years ago the RUST showed up on the leaves and berries. The following Spring, I used Daconil and pruned it in the fall. The following Spring, it didn't show up as much on the leaves and berries. This year I did the first dose of Daconil in the Spring and it leafed out with barely any rust on the leaves but maybe 10% of the berries now have those ugly tendrils coming out. It's now July 25th. When should I hit it with it's second dose? Any and all advice is appreciated
The second dose is usually due in early summer. Follow the instructions on the fungicide you are using. Continue to prune out branches where you can to lessen the transmission of the disease and improve the appearance of your tree.
Once symptoms appear, the tree cannot be cured, but you can prolong its life with the measures you are taking.
https://ag.umass.edu/landscape/fact-sheets/cedar-hawthorn-rust
https://www.gardeningknowhow.com/plant-problems/disease/cedar-hawthorn-rust-disease.htm
I am planning to purchase a Mayhaw Hawhthorn bush and want to know if I can make tea from the leaves.
It isn't usually, since the berries are what are the most medicinal. There isn't much information on the safety of doing so.
These articles will give you more information on the care of your shrub:
What is it and how should a treat it?
Hawthornes are susceptible to several diseases that affect leaves including leaf spots, leaf blight, and fire blight. Your tree has some of the symptoms of fire blight such as the burned looking edges on leaves and the reddish stains on the trunks. Here is more information that should help:
https://www.gardeningknowhow.com/plant-problems/disease/fire-blight-remedies-and-symptoms.htm
https://www.gardeningknowhow.com/plant-problems/disease/plant-leaf-spots.htm
https://www.gardeningknowhow.com/plant-problems/disease/cedar-hawthorn-rust-disease.htm