Are you interested in learning the many ways to propagate hydrangeas?
Hydrangea propagation isn’t necessarily challenging, but there are a few specific steps you will need to follow in order to be successful.
Here’s what you need to know.
How Do You Grow Hydrangeas From Cuttings?
There are a few different ways you can propagate hydrangea shrubs, including rooting new cuttings and ground layering. You can also root cuttings in water, though this is not the most popular option (we’ll tell you more about this at the end of the article).
Method 1: Rooting Cuttings
Start by taking a branch cutting from your shrub. It should be around five or six inches long. Ideally, you should take a cutting from one of your branches that failed to flower this year. These tend to root the best.
Remove the bottom leaves of the lower pair of leaf nodes. If you aren’t sure what a leaf node is, it is simply where the leaf comes out of a branch. This is where roots are most likely to form.
Cut the largest leaves to half their size, then dip the cuttings in a small amount of rooting hormone and put into sterile potting medium or vermiculite.
Water the container well, then allow it to drain. It’s important that you ensure that the soil is moist, though not soggy, then cover the container with plastic. Add a couple of stakes to prevent the plastic from coming into direct contact with the cutting.
Put your cuttings in an allocation that receives indirect light – but is out of direct, bright light. It is important that you do not put the cuttings directly in sunlight when they’re covered in plastic, as they will get too hot and dry beneath the plastic.
You shouldn’t need to water again until the top of the soil is dry to the touch. Overwatering can cause the cuttings to rot. Your cuttings should develop new roots in just a couple of weeks, sometimes longer, depending on the humidity and temperature. Those that are being propagated in warm, humid weather will grow much more quickly.
You’ll know that your cutting has developed roots once it resists your pull when you tug on it.
Method 2: Ground Layering
Ground layering is another simple method. You can only root a couple of plants at once unless you already have a lot of hydrangeas growing in your garden.
To do this, all you need to do is select a plant that you have already growing in your garden. Take a branch that is growing close to the ground, then snip the leaves at about six inches. Do this in the location where the dipping branch comes into contact with the ground when you tug it down (be gentle doing this so you don’t break the plant). Scrub off some of the bark on the underside of the stem, then make sure that at least one of the leaf nodes will be fully underground.
Avoid cutting or snapping this branch of the original plant, but dig a small trench that’s two inches or so in depth and then lower the branch into it. Cover it with soil and then put a stone or brick on the burned area so it remains in the ground.
This will help the branch stay under the soil and keep water (but not pooling water) around the branch. Keep your plant watered – when the roots ultimately develop, you can trim the branch from the original plant and put it in a new location in the garden.
When Should You Take Hydrangea Cuttings?
The perfect time to take cuttings is between the late spring and early fall. You should not wait until it’s too cold outside because this may cause problems with rooting your plants indoors before they have a chance to grow roots in their new location.
Otherwise, your cuttings might fail – it’s hard to keep young plants healthy when you have them indoors during the winter.
Ideally, you’ll need to plan for about six to eight weeks for your cuttings to fully form before you can plant them in the garden.
Can You Root Hydrangea Cuttings in Water?
Water propagation is a technique that has become very popular of late, with people propagating their own celery plants, avocado trees – and yes, hydrangeas! – in just a bit of water.
It isn’t necessarily the best method for rooting hydrangeas, since they don’t love being overly wet. Plus, propagating hydrangeas in water can cause them to develop weaker root systems, which won’t always be successful when you transplant them to the soil.
That said, there have been people who have been successful with this technique – so feel free to give it a try, but be patient with yourself!
Begin by taking a small plant cutting. Position it in a glass of room temperature water, making sure only the stem comes into contact with the water. The leaves and other parts should not. The glass you use should ideally be clear so that you can check on how the roots are developing.
Every few days, change out the water. Make sure your glass is located in direct sunlight (ideally some that is filtered, like in a bedroom windowsill). You can add some liquid rooting hormone to the water when you put the cutting in the jar, but this is optional.
It can take a few weeks for any new growth to appear, but once it does, you can follow the same steps as above for transplanting your new plant.
Good luck – and be patient!