Harmony in the Garden Blog

Adding Height with Flowering, Towering Plants

The surest way to create a wow-factor moment in your garden is to add height with flowering, towering plants. 

Not just a little height either – I’m talking about a lot of height!

When I wander through a nursery or read a garden magazine, the words ‘oversized variety’ is my kryptonite.

I just can’t resist any variety that grows taller than the others. 

I love walking outside and feeling embraced (and even dwarfed) by my garden. 

That feeling instantly grounds me, especially when life is a little crazy, reminding me that I’m just a wee speck in the big picture.   

Adding height with flowering, towering plants

Even small gardens can achieve the same effect. 

Take the photo (left) for example, from my last garden – the bed is only 30” wide, yet see how it still has that towering, embracing effect?  

If you need more proof, just click here to see how we transformed this 20’x30’ courtyard garden.

Or, click here to see this skinny side yard, which feels positively other-worldly with all the towering plants  

Adding height with flowering, towering plants

Last week I was contacted by Monrovia for a story featuring my previous garden. 

Seeing the photos again reminded me just how much I love plants that would be at home in the Land of the Giants.  (click here to read the article)

By the way, if you don’t already subscribe to Monrovia’s monthly newsletter, you’re missing out! 


I always tell my clients the Monrovia newsletter is more like a mini-magazine than it is an email, filled with fantastic plant info, loads of design inspiration, planting how-to with videos, and of course, the amazing plants that you can even order online! 

Adding height with flowering, towering plants

When designing with these tall beauties, I don’t always relegate them to the very back of the border, or the far corners of the garden. 

Instead, I prefer a more naturalistic plant-placement approach, and will put a few tall varieties in the middle, or even the front, of the border.   

(click here for more pics of my client’s garden.)

Adding height with flowering, towering plants

By mixing taller plants in the middle or near the front of a garden bed, it avoids having a garden that looks too forced or contrived. 

Just think about a classroom photo, where the tallest kids are lined up in the back and the shortest are up front.   

It’s so predictable, right? Instead, I want my gardens to appear more natural.

Placing tall plants up front works especially well when the plant happens to be see-through, or light and airy (such as this 4′-tall columbine.) 

When you’re able to see through the tall branches or stems of a plant, this helps prevent it from appearing too ‘blocky’ and out of place in the front of the border.

Today, I’m sharing with you some of my favorite larger-than-life blooming plants that I’ve used extensively in my own garden and those of my clients. 

To make it easier to imagine them in your own garden, I’ve grouped them according to size.

And for scale, I’ve even included some pics of me standing next to a few varieties growing in my garden to help demonstrate their size.

4-5 Foot Flowering, Towering Beauties

Adding height with flowering, towering plants

Acanthus mollis (Bear’s Breeches) Zone 6-10, Deer-Resistant

With flower spikes growing up to 3’ tall, this perennial makes a statement in the garden. 

Creamy flowers are tinged with mauve, and tower above oversized foliage.  In my area, this plant is especially susceptible to hungry snails, so be warned!

Adding height with flowering, towering plants

Kniphofia uvaria  (Red Hot Poker)   Zones 5-9, Deer-Resistant

Kniphofias are available in a wide array of colors (as the creamsicle-vanilla-orange flowers prove in this photo) and are very drought tolerant.

They reliably return year after year, producing dozens of long-lasting blooms.  

I often see the happily growing along the roadside, with zero irrigation whatsoever – that’s how tough they are!

Adding height with flowering, towering plants

Phlomis fruiticosa (Jerusalem Sage)  Zones 8-10, Deer-Resistant

Phlomis, however, is a shrub that thrives in our hot and dry climate. 

This semi-evergreen shrub blooms with 3′-high whorls of yellow flowers in spring, with another flush in the summer.  

Salvia azurea (Blue Sage) Zones 4-9,  Deer-Resistant

Once I learned that this variety grows to a towering 5-feet, with sky-blue flowers, I just had to try it in my Pollinator Garden.

I’ve been so pleased with the long-lasting flowers, watching them transform and elongate as they age.

Euphorbia ceratocarpa (Sicilian Euphorbia) Zones 8-10, Deer-Resistant

My favorite euphorbia variety of all, Sicilian Euphorbia grows to a full 5’x5′, with blue-green foliage and acid-yellow blooms. 

Click here to read all about my other favorite euphorbia varieties.

6-7 Foot Flowering, Towering Beauties

Adding height with flowering, towering plants

Calamagrostis foliosa ‘Karl Foerster’ Zones 5-9, Deer-Resistant

A favorite grass among gardeners wishing to add an exciting jolt of excitement to the back of the garden bed, thanks to its tall and narrow dimensions (5’tall x 3’wide.)

What starts out as a tidy 2′ mound of green blades, will explode into a late-summer vertical display that lasts for weeks and weeks at a time.


Adding height with flowering, towering plants
Adding height with flowering, towering plants

Pennisetum ‘Fairy Tales’ Zones 7b-9 Deer-Resistant

This is another fantastic, towering grass that I’ve used a lot in my gardens. When given a bit of irrigation, it grows much taller than the tag says (4′ – ha!)  reaching heights of 6-7′ in a single season. 

This grass will definitely need staking, but even so it’s a must-have in my garden, begging all who pass by to reach out and touch the soft, textural ‘blooms.’  

This grass doesn’t re-seed, either, which is a bonus as so many grasses can quickly become a nuisance.

If you love grasses, like I do, you might enjoy this post ‘Designing with Ornamental Grasses.’

Adding height with flowering, towering plants
Adding height with flowering, towering plants

Euphorbia lomelii (Slipper Plant) Zones 9-11

For warmer climates, this super tall and narrow euphorbia is ideal for the skinnest of spaces. 

I have several throughout my garden, and have found they’re not as cold-tender as I thought.  They’ve easily survived winter temps down to 35 with no damage at all.

In the summer, the tell evergreen, reed-like stems produce the cutest little red flowers that look like an elf’s shoes.  Very low water, too, and takes full or partial sun.

Rudbeckia triloba (Brown-Eyed Susan) Zones 3-9 Deer-Resistant

Another perennial that proves once again the internet is filled with misleading information!  

As you can see, when happy the towering clumps of late summer blooms easily reach 7′ (not the 4′-5′ that Mr. Google says.)

This perennial can be short-lived, but luckily it produces offspring that can easily be transplanted throughout your garden.

As a side note,  with all the height we’re talking about, comes the need to support the plants. 

That’s where my second obsession comes in – my love of teuturs and obelisks (if you missed this post, click here  

A simple and fairly inexpensive support  I use is the one to the left, (shown here with a rudbeckia triloba growing through it.)

Adding height with flowering, towering plants
Four Seasons of Salvias

Salvia canariensis (Canary Island Sage)  Zones 8-11, Deer-Resistant

One of my all-time favorites for ginormous height, this variety quickly grows to 7′ and will be covered with purple blooms throughout the summer.

And don’t forget, plants this tall serve another function – they’re gorgeous barrier plants, providing much-needed privacy.   

If you’d like to read more about my tips for landscaping for privacy, click here. 

8-10 Foot Flowering, Towering Beauties

Adding height with flowering, towering plants

Adenanthos sericeus (Australian Wooly Bush)  Zones 9-11, Deer-Resistant

I’ve written about this warm-climate evergreen shrub before (click here for some container inspiration) but I wanted to mention it again.

I can’t get enough of the textural, soft ‘branches’ of this 8′ beauty, stopping to ‘pet it’ every time I pass by.  

I’ve found they do really, really well in an oversized pot versus in the ground. They also require very little water once established.

When happy, tiny little red flowers adorn the tips of the branches.  It’s so worth trying one of these in a sheltered location!

Melianthus major ‘Antonow’s Blue’  Zones 7-10

Wowza!  Take a look at the oversized, textural, blue-green foliage of this giant!  It also has late-spring, nectar-rich burgundy blooms that are equally as impressive (well, almost.)

Adding height with flowering, towering plants
Adding height with flowering, towering plants

Salvia mexicana ‘Queretaro’, Zones8-11, Deer-Resistant

Growing larger than it’s cousin, ‘Limelight’, this 10′ salvia blooms in the fall, providing several months of color.

Covered with iridescent blue/purple flowers and bright chartreuse calyxes, it’s a show stopper in the back of the border.

The hummingbirds will thank you for their late-season nectar source, too.

Adding height with flowering, towering plants

Eremurus (Foxtail Lily)  Zones 5-8, Deer-Resistant

The foxtail lily is my very favorite towering flower of all. 

With rockets of blooms available in a variety of colors, these spires easily grow upwards of 7′ (most likely taller in a climate with a bit more moisture.) 

I particularly love this ‘Oase’ variety, pictured here, with the soft peach blooms.  To see how I’ve used them in my garden, click here.


foxtail lily

Salvia purpurea ‘Lavender Lace’ Zones 9-11, Deer-Resistant

Blooming in the WINTER (winter, folks!) this 10′ tall tower of flowers is a must-have for a sun to part-sun garden. 

It begins blooming in late October and depending on the severity of winter, can last all the way through to January.

For more information about salvias for all FOUR seasons (yes, even winter!) click here.

Four Seasons of Salvias - Lavender Lace

10-14 Foot Flowering, Towering Beauties

Adding height with flowering, towering plants

Grevillea ‘Long John’, zones 9-10, Deer-Resistant

I plant a lot of grevillea varieties, but when there’s room I always include a ‘Long John.’

Growing to 12′ (or more, if it loves your garden) the airy nature of this plant helps to prevent it from appearing too bulky in the garden.  

Its unique foliage looks like very long, thin pine needles that create a wispy see-through effect in the garden.

The flowers are a dark rose-pink color that attracts hummingbirds as well as a ton of beneficial insects and bees. (click here for more of my favorite grevilleas – of ALL sizes!)

Adding height with flowering, towering plants

Lagerstroemia (Crepe Myrtle) Black Diamond ‘Best Red’ (left) and Sunset’s ‘Delta Fuchsia’ (below)  Zones 7-10, Deer-Resistant

These dwarf varieties only grow to 10′ or so, and are amazing for late-summer blooms. 

Even more amazing, let’s just talk about that dark foliage that lasts through the heat of the summer! 

Grevillea ‘Moonlight’ Zones 9-11, Deer-Resistant

Another tall variety of grevillea (12’+) ‘Moonlight’ is unique in that it has elegant creamy white blooms. 

Most grevilleas have flowers in the pink, orange, red shades which makes ‘Moonlight’ so special.  

Ceanothus ‘Ray Hartman’ Zones 9-11

This is a super fast-growing upright ceanothus, which will eventually reach 15 feet or so.   

It has a soft, cascading form which I appreciate in the very back of the border (along with the early spring blue flowers.)

It’s not deer-resistant, but when surrounded by other plants with thorns (ie: barberry,) I’ve found the deer stay away.

You may be wondering why I didn’t include any vines when talking about towering flowers (especially since Monrovia featured some of my favorites!) 

Stay tuned!

I’m working on a great post about ways to create privacy in the garden, where I’ll talk much more about vines (and loads of other things, too, of course.)

Take a peek at a few public gardens below that have had a hand in fueling my love of giant, oversized, land lush borders.  And note how often an oversized plant is placed in the front of the border, and how it doesn’t seem out of place. 

If the pro’s can do it, so can you!

Adding height with flowering, towering plants

The Bellevue Botanic Garden

One of my favorites for over-the-top towering inspiration.  Just take a look at the 10’+ False Hemp that gently arches over the pathway.  

Adding height with flowering, towering plants

Central Park’s Conservatory Garden

The queen of using oversized, towering plants in a garden has to be Lynden B. Miller, the designer and creative genius behind the Conservatory Garden.


Okay, this post is long enough! 

Please share some of YOUR favorites with us, and why you love them so.  

Enjoyed this article?  Please share it with others: 

Please leave a comment below


  • Hi Rebecca, I was wondering if you knew about the roots of the Ceanothus ‘Ray Hartman’? I’m at a loss as to what to plant along the wall of the backyard. The landscaper was supposed to leave a bit more room than he did, for my flower beds. The reason I’m asking is, the patio decking is now pavers and I don’t to plant something that will lift the pavers.

    I’m so glad that I decided to come back to you page, it’s helping me visualize.

    • Hi Lynn, so nice to hear from you. I don’t really have any experience with ceanothus roots lifting pavers, but I do know that they have deep tap roots (good for pavers!) which is why they can survive without much summer irrigation. You might use my search bar, typing in ‘skinny spaces’ for more inspiration to hopefully find tall and skinny plants for your smaller garden beds. So sorry they didn’t turn out as wide as you wanted them to (I come across this all the time, so at least you’re not alone, if that helps ease the pain.) Ilex ‘Sky Pencil Holly’ is a wonderful tall & skinny plant, there’s similar boxwoods with similar dimensions, as well as tons of columnar plants. Good Luck!!!

      • Thank you, for your help and commiseration ;-). I’ve got about 60’ of planter, up against a stone wall to fill. The landscaper we hired was supposed to come back with a plan, his plan was telling me how many trees and plants of different sizes that it included, absolutely not what we discussed a couple of months ago. Will see what I can find in the section you suggested. Give your mom my love.

  • It does help, thank you. It would be wonderful to welcome you to our beautiful area–I felt a kindred spirit the first time I came about your blog. I’ve shared it with several friends since.

    • Ahhhhh, that explains it then, Paula. When I look at my blog’s stats, Italy is always #4 on the list so I have YOU to thank for this. 🙂

  • Thank you for all you share. I so look forward to your blog, which I always find inspiring. You’re a rock star!

    • Oh gosh, Katie, thank you! My three favorite things are talking about gardening, gardening itself, and taking photos in the garden so I’m always happy to find others who enjoy it, as well (that way, I don’t bore my family to death!)

  • Wow! How beautiful your photos are and such wonderful info! I love rudbeckias and am intrigued by the ginormous option you showed!! The grevillia ‘Moonlight’ is stunning and I never see that one in gardens, which is surprising, given how lovely it is. I planted a ‘Ray Hartman’ ceanothus in my front garden many years ago and it looks like a small oak tree – so nice to have an evergreen, neat tree that the birds love. In flower, it’s a stunner, just a great plant all around!!

    • Hi Ronnie, I had to order the rudbeckia ‘Henry Eilers’ from an online nursery as I’ve never seen it available here. But I HAVE seen the ‘Moonlight’ at our local Green Acres, which means they’re finally making it somewhat more available. When in bloom, it’s really beautiful – especially on an overcast day. I hope you can find one!

  • Love your posts. This one will help me a lot in planning my Ft. Bragg lot! Thanks.

  • This was a great article and very timely for me as I’ve been wanting to add some tall plants. I have a quick question regarding the zones–I live in the Cinque Terre in Northern Italy, near Genoa which says we are zone 9b (nine b). In all of your recommendations, you only list zone 9, would this be the same?
    I’m originally from San Francisco and I love your blog thank you so much for all the great information.
    We have a gorgeous BnB –please come visit us.

    • Hi Paula, thank you for your kind words about my blog and WOW, how wonderful that you’re in Italy with a gorgeous BnB. I’ve been there twice and we’ve been talking about trying to go again next year – it’s our favorite place in the world, lucky YOU!!! That’d be my dream, staying at your place, wandering your garden and talking about plants….don’t even get me started. 🙂 I think your zone would be acceptable for many of the plants I’ve talked about and is definitely worth a try. It seems the difference between the 2 zones is a 5 degree minimum temp difference. So if a plant is hardy to 9b, it doesn’t want temps colder than 25-30, whereas a plant hardy to zone 9 can it a little colder, down to 20-25 (though, quite honestly, that’s pretty cold and the plants would definitely show damage but would still most likely return in the spring.) I hope that helps!


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