Could be too young or not getting the right conditions (amount of sun, water, nutrients).

My H. 'Harmony' took a few years to bloom and then maybe one or two blooms while the rest of my oakleaf varieties bloom reliably (Snowflake, Snow Queen, Ellen Huff, Alice, Ruby Slippers, and Little Honey). My Munchkin though died at the top and has new growth at the bottom so no blooms at all this year (maybe a little too much shade for it to do well).

Hang in there! Enjoy the fall color change and exfoliating bark in the meantime.

Many shrubs come from the nursery blooming (to increase sales) where they are coddled and perhaps treated with hormones, but need a year or two in the ground to grow roots and increase in size enough to bloom in the garden, so yours is most likely putting on most of its growth invisibly underground. I usually don't expect a shrub to bloom the first year, and not much the second year, depending on size. If it was small (many of mine weren't much more than rooted cuttings), it might even be three or four years.

That said, be sure to test the soil (a finger inserted to the second knuckle to check for moisture) to be sure it is getting the right amount of water, and mulch the ground around it out to the drip line and a bit past to help keep moisture and temperatures more even.

Your name doesn't give any info about your zone or location, which often helps with questions like this. For instance, right now, much of New England is in a drought, so many plants aren't at their best, and new plants need special attention. If you want to add location info, here's how:

Go to Your Houzz in the upper right of every page, click Edit Profile, and on the left side click advanced settings. Well down the advanced settings page is a blank labeled Climate Zone for Garden Forums along with a link to find your zone.

If you add info on your state or the nearest large city you will get even better information since zone only relates to average coldest winter temperatures.

Then return to the top of the page and click Done Editing.

Improper/insufficient waterings can keep the plant stressed so it does not grow much. But they can also take 1-3 years to spur growth as they become established in your garden. Make sure it has mulch and that you water it plenty like 1 gallon or more per watering in the Summer. Deer or mild winter temps followed by late frost could eat/kill the blooms. Too late to be fertilizing now so do this only in the Spring or with very low nitrogen fertilizers.

Deer eat most of the dormant buds in the winter months. They're velvety looking things with points like on a head-worn crown, located at the branch tips. Easy pickings. Try using netting and Liquid Fence spray in the off-season. Also use on yews, arborvitae and euonymus.

After you've checked for problems with animals, pruners and minerals try to accept the fact that many long lived shrubs and trees will not bloom for at least a year after planting. As mentioned before they are forced into early bloom for sale value, are set back by planting and transplant shock and perhaps less fertilizer (that's a good thing in a home garden). In the home garden, flowers in the first season are a bonus, but should not be expected.

I will chalk it up to being the first year. Definitely, no deer since I am smack in the middle of suburbia.

And you might very well get some wonderful fall color. That will provide enjoyment.

Oakleafs sometimes do not nloom well until larger. Too little light can also hold back, at least density of blooms on plant.