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Garden, Plants

What size plant to buy? An observation of shrubs

July 23, 2018

oak leaf hydrangea

Do you ever wonder what size plant you should buy? Is that bigger plant really work twice the price of a smaller plant?

I have no clear position on this. Years ago when I was first starting this garden I got very involved in a plant co-op that I purchased dozens (or maybe hundreds) of plant liners through. It allowed me to buy a lot of plants that I never could have afforded, but they were a lot of work. Some of those plants are now important features in my garden but many others didn’t receive the nurturing they needed and failed.

I remember having a discussion about the cost of plants with a gardener many decades my senior once. She quipped that she was too old to buy small plants. 

Two sizes of Gatsby Gal hydrangea

But the point is well taken: When you buy a bigger plant, you’re buying time. And you’re not just buying the time it took to grow a plant to that size, you’re buying the initial pruning and training of it (in the case of some trees and shrubs). You’re also buying the time you won’t have to spend fawning over it when you bring it home. All plants need water and care to get established, but a plant with a bigger root system will be far better off tolerating a little bit of neglect.

On the other hand, sometimes smaller plants adapt better to a new home and they will catch up with that bigger plant at some point. Just how long that will take depends on the plant and the difference age and size, but I have several spireas that started in quart-size pots just four or so years ago that I would say are now fully grown.

Gatsby Gal bloom

It’s an interesting conundrum, and now I’m undertaking a little observation (this is hardly science-based so I’m going to avoid calling it an experiment) with Proven Winners. They sent me two of the same shrub—the beautiful oakleaf hydrangea called Gatsby Gal—in two different sizes. The larger plant is in what they call an 8-inch jumbo pot, which is, by my eye, bigger than a gallon container and not quite as big as a two-gallon container. It sells for $37.99 from Garden Crossings (I did not price it locally). The smaller size is a quart pot, which isn’t much bigger than the pots you buy annuals in. It sells for $20.99. 

Gatsby Gal hydrangea

The larger of the two is offset from the Picea at the front of that bed.

two Gatsby Gal hydrangeas

The smaller shrub in the foreground with the larger in the back (looking perpendicular down the bed).

I planted them in the same area of the garden, about 8 feet apart—they get about 5 to 6 feet tall and wide—and hooked them up to the nearby drip line already running to the hornbeams. They are planted in part sun, getting probably six hours a day or so. This isn’t a test to treat them exactly the same way; the goal is to have them both survive and thrive. I’m expecting the smaller plant to need a little more tending. 

I’ll keep an eye on these two shrubs over the next few years and keep you informed as to how they grow over the next few years. 

oak leaf hydrangea

gatsby gal hydrangea oak leaf hydrangea Proven Winners shrubs
by Erin @ The Impatient Gardener 
12 Comments

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Comments

  1. Lisa at Greenbow says: July 23, 2018 at 6:42 am

    I like the process of watching plants grow. I guess I am not to the age of not having that time. I would purchase a larger plant if I needed immediate impact. I have always thought the opposite about plant size nurturing needs. The larger plant is used to constant watering and perfect soil conditions. The smaller hasn’t gotten used to that and adapts easier to my poor soil. ha… So it goes.

    Reply
  2. sarah says: July 23, 2018 at 7:32 am

    I put in eight Miss Ruby butterfly bushes this June and bought the small pots from Proven Winners. Couldn’t be happier! They started at three inches and are already over two-feet-tall and blooming like crazy. For slow to moderate growers I don’t mind paying for the bigger pots, especially if it is in a high-traffic area.

    Reply
  3. Linda Brazill says: July 23, 2018 at 11:20 am

    I still buy things in small sizes but more often that is because that is the only size I can find. With shrubs these days, I want them big enough to make at least a modest impact. Can’t tell you how many times I’ve stepped on a tiny shrub that I’d forgotten about.

    Reply
  4. Cortney D says: July 23, 2018 at 6:04 pm

    This is always an interesting situation. We are lucky enough that our “local” Destination Garden Center always has multiple sizes (even 3 or 4) of every shrub they carry. My general rule is buy big when it is a specimen or one-of plant. When one needs 5 or more (like installing a hedge, like we have done on a number of occasions) we go small so that I don’t do the thing where I skimp on the proper number of shrubs to fill the space because I can see the tally at the register going higher and higher, faster and faster.

    Reply
  5. B Johnson says: July 29, 2018 at 6:11 am

    I paid to have a six larger Rose of Sharon shrubs put in a couple of years ago. They were beautiful and did well. Last spring’s freeze/thaw in southeastern WI killed them all! The financial investment of larger plants that don’t make it hursts….

    Reply
  6. Jason K says: August 2, 2018 at 10:00 pm

    I’ve read that this has a big impact on transplanted trees, where the root ball can sometimes be quite a bit smaller than the volume of what’s above ground for larger transplants. I wish I saved the journal article that I read earlier this year, but the authors showed that smaller transplanted trees became larger than the originally larger transplanted trees after about 5-10 years. Maybe the period it takes for the smaller plant to overtake the larger one will be shorter for shrubs – it’ll be interesting to see what happens!

    Reply
    • TJ A says: May 11, 2020 at 3:00 pm

      What is the update on this? How do the two compare now?

      Reply
  7. Ken says: June 2, 2020 at 2:25 pm

    Wheres the follow up?

    Reply
    • Erin @ The Impatient Gardener says: June 5, 2020 at 12:42 am

      Hi Ken,
      You can follow progress of this on my YouTube channel where I’ve been checking in annually. I expect to do another update in a month or so there.

      Reply
      • Mohini says: February 27, 2021 at 6:41 pm

        Hi Erin,

        I looked and couldn’t find which youtube video showed the progression of the two hydrangeas. Can you put a link?

        Thanks!
        Mohini

        Reply
  8. Ashish says: May 27, 2021 at 11:37 am

    Hi Erin,
    I just subscribed to your YouTube site but I don’t see the update to the hydrangeas planting of different sizes. Can you post the link?

    Reply
  9. Midwest Chick says: April 6, 2022 at 7:57 am

    Also looking for a link to the update!

    Reply

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The Impatient Gardener

Do you love gardening? Me too! I'm Erin and I garden in Southeastern Wisconsin, zone 5. The Impatient Gardener is all about real-life gardening: the good parts, the bad bits and even the funny stuff. It's part information, part inspiration and a little bit commiseration. Thanks for visiting.

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