As you may have gathered from the title, Forsythia are not my favourite shrub. I try to work with the natural growth habits of a shrub, anticipating how it will grow after I cut. With Forsythia, however, I find this next to impossible. The buds are in alternate, opposite pairs, which should make predicting future growth dead easy, but the thing just grows all higgledy-piggledy and I am far less confident that I am pruning to maximize flowering than I am with almost any other shrub. People like them because they give some of the earliest colour in the garden (at least here in North-East North America), despite the fact that they don’t have much to recommend them the rest of the year.
Here is what happens if you try to shape them, as some people do. You end up with bald patches with no flowers in the spring because the potential buds got cut off the summer before. I ask you, what’s the point!
Now here, below, is how they look if you let them follow their natural higgledy-piggledy inclinations. A lot messier, but a lot more colour. I think they work best on larger properties, tucked away in a far corner where you can see a burst of yellow from them in the spring and then ignore them the rest of the year. However, this blog is about pruning, so here is the pruning part of this entry.
Here’s the same shrub after it had finished blooming. As you can see from this angle, it does tend to list to port and compete with the Viburnum next to it. Here quickly are the before and afters from last year when it was even more jungly. (That’s a real word in my family – even if it’s not in the dictionary)
Before
←last year
After
(both years)
←last year
As you can see from both years, the shrub is a lot lighter when I’m done with it, but spends the rest of the year getting caught up. I know the front looks rather bare this year. There was a further forward stem I was hoping to keep, but it got damaged in the pruning, and had to go. However, I know that lower stem with the two young shoots will fill in the center for me. (At least I hope it will – as I said, Forsythias are a bit unpredictable.)
So here are the before and after from this year.
As you can see there is not much to choose between the two this year, but the front middle is starting to fill in a bit.
Just as an afterthought, I would like to put in a plug for Hamamelis japonica (Japanese Witch Hazel – to the left and below) as an alternative. It has a nice, regular, shape and blooms about a month before the forsythia. Then if you really want to go to town you could get Hamamelis virginiana (NA Witch Hazel) as well and have the last thing to bloom in the fall.