Late winter and early spring is a great time to do a lot of pruning around the yard. But what do you prune and how?
We'll start by talking about hydrangeas since they seem to be in just about every yard around here. Before you can prune a hydrangea you will need to determine what kind you have.
What you are really trying to determine is when they bloom; off of wood from last years growth or off of growth from the current year. If you have a hydrangea that blooms on growth from last year and you cut it to the ground now...you've lost your blooms for this year. Whereas if you do the same with one that blooms on new wood...you will still get blooms if you where to prune hard now.
Here's a list of some of the most common Hydrangea species grown around the PNW:
-Hydrangea macrophylla, Mophead or lacecap hydrangeas
-Hydrangea quercifolia, Oakleaf hydrangeas
-Hydrangea paniculata 'Grandiflora' - Pee Gee hydrangea
Here are a few quick pruning tips for each type of Hydrangea:
Mophead & Lacecap Hydranges: These hydrangeas bloom earlier on growth from last season.
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Spring pruning: The rule of thirds is key at this time of the year to ensure good blooms and a healthy full plant. The key to keeping your flowers is to cut back to where you can see some nice healthy green buds.
-Remove 1/3 of oldest stems all the way to the ground
-Cut 1/3 of stems in half, cut to a healthy bud
-Remove tips of remaining 1/3 of branches, cut to a healthy bud
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Summer pruning: Pruning late in the summer will promote more new growth that may be more susceptible to freeze damage in the coming winter. Because of this it may be best to avoid hard pruning at this time. It is however, a great time to cut back stems with blooms on them to enjoy inside.
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Oakleaf & Pee Gee Hydrangeas: These hydrangeas bloom later on new growth from the current year.
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Spring Pruning: Spring is the time to do most routine and restorative pruning. If you need to reduce the size of the plant or just thin out the weaker or oldest stems now is a great time.
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Summer/Fall Pruning: Avoid pruning in summer before it flowers as this will cut off the flower buds. The best bet, should you need to prune, is to wait till just after it flowers so you don't miss the floral display.
This is a
very quick overview of Hydrangea pruning. To get more details and diagrams on how to prune check out one of the great references below.
Great pruning references to check out:
'The Pruners Bible" by Steven Bradley. A great book for people learning how to prune. References many of the most common shrubs, vines and trees in our region.
"American Horticultural Society Pruning & Training" by David Joyce. This is a more indepth book on pruning. A great reference if you have a diverse garden or if you're really into pruning.
The Plant Amnesty website. You'll find great info on pruning techniques and references to horticulture professionals who can do it for you. They also offer great pruning classes.