A magnolia tree thats is not blooming might be affected by the following factors

Age

Young magnolia trees take several years until the flowers start to blossom. If your magnolia tree is young and has never flowered before, then this may be the reason and all that is needed is patience.

Pruning

Magnolia trees typically require very little pruning, as it can sometimes cause damage to the tree and prevent it from flowering. If your magnolia tree must be pruned, consider hiring a professional.

Sunlight

Magnolia trees love the sun. They will not grow well in shade or even partial shade. If your magnolia tree isn’t flowering, then make sure it’s in a spot that gets plenty of sun.

Water

Young magnolia trees should be watered 2-3 times per week. If your magnolia tree is established, then make sure you aren’t over watering it as that can cause damage to the tree and prevent it from producing healthy flowers.

Diseases

Magnolia trees typically aren’t especially susceptible to diseases, but it can sometimes still happen. Diseases are usually fairly easy to spot. The most common signs of disease are discolouration of leaves, spots, or wood decay.

What to do if your magnolia tree didn’t bloom

If your magnolia tree didn’t bloom this year, it’s likely due to one of the reasons mentioned above. Try to determine the reason and make a change accordingly. If you’re still unsure, consult an arborist or professional landscape and garden service near you to determine the best way to treat your magnolia tree.