Wisteria is one of, if not the most, beautiful blooming vines to exist. They’re romantic and old-timey, yet they are notorious for being stubborn and reluctant to bloom.
Wisteria is a common frustration for gardeners everywhere, leaving them continuously asking, “why are my wisterias not blooming?”.
There aren’t any deep, dark gardening secrets that will show you the way to help your wisteria bloom.
Equipped with a bit of knowledge, you’ll have great purple vines adorning your garden and house in no time.
Why Are My Wisterias Not Blooming?
Too much nitrogen, improper fertilization, excessive pruning, environmental problems, and maturity level are the most common reasons wisteria won’t bloom. When you understand the details of each of these issues, it becomes more accessible to fix the problem.
Helping Your Wisteria Bloom
If you went out and purchased wisteria to celebrate the incredible blooms that come with it, you’re not alone.
Taking the time to plant it, nurture it, and then discover that you lack flowers can be annoying, to say the least.
Excessive Nitrogen in the Soil
Possibly the most common reason that wisteria won’t bloom is that too much nitrogen will cause plenty of foliage and zero blooms.
There are plenty of ways to reduce the amount of nitrogen you’ve got in the ground, including inserting plants that use up a good amount of it, such as squash, corn, and broccoli.
Remember that you won’t get much fruit from these plants, as they are there to soak up the nitrogen and not for sustenance.
You can use mulch to get rid of nitrogen as well. Inexpensive, dyed mulch made from soft wood is perfect for this job.
Adding a phosphate fertilizer to young wisteria in the spring will add phosphorous to the soil, balancing out nitrogen and creating a better blooming environment.
You can tell if you’ve got too much nitrogen by the look of your plants, lush and green but refusing to flower.
Wisteria Environment Not Suitable
Another reason for the lack of blooms on your wisteria is the environment in which you’re planting and growing them.
Wisteria is a plant that loves the sun and well-draining soil. If they don’t have these things, they will become stressed, and you’ll find that they grow beautiful foliage with no flowers in sight.
You can fix this by replanting your wisteria, especially if sunlight is the issue. If your soil is the problem, you might want to try planting it in a raised bed.
Many novice gardeners are unsure when to fertilize their plants, primarily because the process can be so different from plant to plant.
For example, fertilizing mature wisteria in the spring (or at all) will give you green, luxurious foliage without the blooms you so desire.
When it comes to fertilizing wisteria, please stick to one dose in early spring as long as the plant has not yet filled the space you’ve provided it.
Once it’s mature, you’ll not need to fertilize it. Doing so can stunt the blooms.
Wisteria has to reach a specific maturity level to bloom. While most wisteria purchased from plant nurseries are at the flowering age, some may not be.
This fact might seem shocking, but wisteria will be between seven and fifteen years of age before it blooms. Give it time!
You Might be Overpruning
Any seasoned gardener will tell you that it’s challenging to over prune wisteria, but that doesn’t mean it’s impossible!
Over-pruning wisteria will cause the flower buds to come off, either from cutting them or affecting them as you snip.
Wisteria cannot bloom if the flower buds are gone. This issue is not as common as the others, but it does happen, so take care when and how often you prune your wisteria.
Remember, always prune wisteria about three feet from the trunk, as going any lower has the potential to kill it, and then you can say goodbye to those blooms!
Frequently Asked Questions Why My Wisterias Are Not Blooming
My wisteria is mature and still won’t bloom. How come?
If your wisteria is of age and still won’t bloom, it’s imperative to check the location, drainage, and nitrogen levels in your soil. If your wisteria has plenty of healthy leaves and won’t flower, nitrogen is your problem.
Is there a test to find out if the soil is well-draining?
There is a super simple test that most gardeners use to tell if their soil is draining well. You can drill a hole into the ground, as many inches deep as you see fit, but far enough down to where your plants’ roots. Fill the void with water, and monitor how quickly it drains. One inch per hour means well-draining soil.
Can I replant my wisteria to accommodate a better blooming environment?
If your wisteria isn’t getting enough sun or the soil drains poorly, you can replant it. Ensure that you give it enough space to establish and re-root, and if the earth is the issue, you can plant it in a raised box on the ground.
Encouraging Your Wisteria to Bloom
Wisteria is beautiful when in bloom, but it can be a long road to get there.
Wisteria is hardy, but it needs attention and love to turn from basic greenery to gorgeous colors.
Going through the potential bloom-disrupting checklist that we’ve provided here should help you figure out what is at the root of your problem, no pun intended.
Marcel runs the place around here. He has a deep passion for houseplants & gardening and is constantly on the lookout for yet another special plant to add to his arsenal of houseplants, succulents & cacti.
Marcel is also the founder of Iseli International Commerce, a sole proprietorship company that publishes a variety of websites and online magazines.