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When designing a four-season landscape, seasonal flower and plant groupings are a topic that always comes up. It can be confusing to understand the terms. When I was a beginner gardener, I always thought that seasonal flowers bloomed all year round– in every season– all the time.

But… I never actually found that perfect flower or plant that just magically bloomed all year round. Especially in Northeast PA where temperatures range from 90ºF in summer to -10ºF in winter.

I know… it was wishful thinking at best. But, as I got a little more experienced with my gardening I was able to understand what seasonal flowers and plant groupings actually were and what flowers and plants were best to use in different areas of my garden.

Want to learn more about this? Keep reading to pick my brain about this really interesting and fun garden design concept!

What is a Seasonal Flower or Plant?

A seasonal flower or plant is one that is currently blooming or ‘in season.’ Many also refer to seasonal flowers and plants as ones that have exceptionally long bloom times. Meaning, they are blooming in multiple seasons. These are great flowers and plants to add to your four-season landscape. This is because you are getting a big “bang for your buck” as far as the interest the flower or plant provides for the amount of space it’s taking up in your garden.

Types of Plants and Flowers

Before we go any further on this topic I think it’s important to understand the different types of plants that can be in your landscape.

Perennials are plants and flowers that come back year after year. Since you don’t have to replant them, they are perfect for your garden beds, as accents to shrubs and trees, combined with annuals and bulbs and in containers and window boxes. Perennials often increase in size each year, so they can be divided and added to other seasonal plants and landscape areas.

It’s important to note that perennials are only “hardy” to certain temperatures, this is all based on your gardening zone. So, if you live in a colder climate, some perennials are treated as annual plants because they can’t survive the winter. These are called tender perennials.

Annuals complete their life cycle in one year; they will not rebloom year after year like perennials do. But, some annuals will drop seed that self-sows so new plants will appear in your garden next year. A few examples of self-sowing annuals are:

  • Mexican poppy (Argemone mexicana)
  • Snow-on-the-mountain (Euphorbia marginata)
  • Cuphea (Cuphea llavea)
  • Button flower (Gomphrena globose)
  • Sweet alyssum (Lobularia maritima)
  • Love-in-a-mist (Nigella damascena)

For other annuals, seeds may need to be collected at the end of their life cycle so you can replant them the following year. Biennials are very similar to annuals, except their life cycle takes two years to complete. So, they typically bloom every other year (unless you plant their seeds in consecutive years).

A mix of annual plants can offer an array of vibrant colors in your garden beds. They are also a great solution for container gardens and decorative pots. Annuals are also great for newer gardens. They can fill in the space and keep down weeds while you wait for your perennials and shrubs to mature!

Although you have to purchase and plant new annuals each season, annuals create a beautiful swath of color in your landscape. I prefer perennials because they mature and come back from year to year. However, most years I will also buy a few flats of annuals to create color drifts and continuity in my landscape.

Salvia, Lavendar and mexican wheat grass make great seasonal flowers and plant groupings
A seasonal plant grouping of Mexican feather grass, salvia and sage in this design by Thomas Rainer. Source

What Are Seasonal Flower & Plant Groups?

So what exactly are seasonal plantings or seasonal groupings? In a four-season landscape, the goal is to group plants that bloom at similar times or sequentially (one after another). Try to make each “garden room” in your landscape bloom for as long as possible.

A four-season landscape doesn’t mean that each area of your landscape needs to be in bloom every single season! There will be peaks and lulls to each seasonal grouping that will move the interest in your garden from one area to another.

By creating different interest groups in different areas, your gardens will change and give you a different look and feel as different plants begin to bloom.  This is what I absolutely love about seasonal groupings. You can basically change the entire look, color scheme and focal point of your garden throughout the seasons.

Quick tip: To learn more about creating a four-season landscape, check out my post on landscape layering. I also have a post about arranging plants in your landscape that should help you with creating these groupings.

azaleas and dogwoods at Winterfur for a seasonal flower and plant grouping.
Azaleas and dogwood trees at Winterfur (Source)

Example of Spring Plant Grouping

With that said, I still like each garden room to bloom for as long as possible. This is done by sequential blooming. For example, the Cornus Florida dogwood tree blooms for about three weeks in May. Just as the white or pink flowers give way to the tree’s foliage, the Kousa dogwood blooms for the entire month of June. By adding both of these trees to your seasonal grouping, you’ll basically double the bloom period. This is called sequential blooming. Pretty cool, right?

But it doesn’t have to stop there. You can also plant other shrubs and flowers with the dogwood trees to keep the bloom story going. Many azaleas and small-leaved rhododendrons bloom at the same time as the dogwoods and will be very complimentary. You could also add some early-blooming perennials like bleeding hearts, violets and Virginia blue bells (one of my favorites for shade) to round out your garden room.

This is a great option for spring, but don’t forget to complete the plant grouping by adding summer and fall bloomers as well as plants for winter interest. Again, my landscape layering article covers a lot of this!

Example of Extended Bloom Sequence

Another example extends the bloom time of just one single flower: alliums. I like to call this bloom sequencing but I’m not sure if there’s an official term for it.

Did you know that there are all different varieties of alliums and if you do your research you can actually plant them so that they will sequentially bloom in your garden? I absolutely love alliums and the idea that I can enjoy them for longer is music to my gardening ears.

4 Large Allium round purple flowers along a fence
Allium ‘Beau Regard’ is just one of many allium varieties that can be planted in succession for an entire year of blooms! Photo by Pretty Purple Door.

In early spring, allium varieties such as purple sensation, giant online, Turkestan onion, tumbleweed and golden onion will get you started. In late spring, check out gladiator and white giant. Summer varieties include nodding onion, blue globe onion, stars of Persia, black onion, drumstick, hair and circle onion. In the fall you can end the season with ‘Glaucum’ and ‘Ozawa’ varieties.

Here are some handy charts with other varieties to try.

I told you there were a lot of alliums!

How To Create Your Own Seasonal Plant Groupings

So, how do you figure this out on your own? The answer is plant research! There are many online databases to research plants online. Even a lot of the online nurseries have search features that will help you to find plants and flowers that bloom during particular times of the year. My garden planning worksheets are a great printable resource for conducting plant research. You fill in the name of your plant and you can visually mark off the times that it blooms. That way you can see where you may have bloom gaps in your garden and find plnats that will fill those gaps.

The other secret to creating seasonal groupings is layering your landscape. I have a whole article on this concept, so definitely check that out. In a nutshell, layering involves creating garden beds that are deep so that you can create a foreground, middle ground and background row of plants. Within the garden beds, you mix all different kinds of flowers, plants, shrubs, evergreens and even trees together to make a beautiful ensemble of plants. Layering combines the best of both worlds: lots of plant variety and lots of sequential blooming.

I also have an online course that will teach you how to create a 4-season garden bed step-by-step using these concepts.

Long-Blooming Flowers to Try at Home

When creating a four-season landscape, most beginner gardeners are looking for the “magic bullet” flower or plant that will bloom in all four seasons. Wishful thinking. Unfortunately there is no flower (that I’m aware of) that actually blooms constantly, although there are ways to make flowers bloom more (and longer).

But don’t worry, there are plenty of perennial plants and flowers that do have beautiful and interesting features in each and every season. So, while you won’t be able to find one single flower or plant that will accomplish this for you, with a little planning you’ll be able to create a garden that has something in bloom each and every season! Preferably, lots of things!

Flowers that stay in bloom the longest

While I can’t tell you about this secret magic bullet flower, here are some that come pretty close. These seasonal flowers that have exceptionally long bloom times. Click on the links to purchase these online.

  • Asters – summer through early fall
  • Astilbe – late spring through summer (great for shade)
  • Black-eyed susans (Rudbeckia) – summer through early fall
  • Blanket flower (Gaillardia) – late spring through fall
  • Catmint (Nepeta) – early summer through fall
  • Coneflowers (Echinacea ) – summer through early fall
  • Clematis vines – late spring through early fall
  • Daylilies (Hemerocallis) – summer through early fall
  • Lavender (Lavandula) – summer through early fall
  • Pinks (Dianthus)- mid spring through early fall
  • Salvia – late spring through early fall
  • Sedum – mid summer through fall

Wrapping Up

Seasonal flowers and plants are ones that are either in bloom in the current season. Or, ones that bloom for multiple seasons of the year. These can be perennials, annuals, self-sowing annuals, or even biennials. When creating seasonal groupings in your landscape, you should pick plants, flowers, shrubs and trees that blooms at the same time of year and put them into the same area. I call these garden rooms.

In addition to planting what blooms at the same time, you should also look for ways to extend the bloom period of your seasonal groupings. This can be accomplished by sequential blooming. Or, in other words, choosing plants and flowers that bloom right after another in the season grouping. This keeps your garden room full of color and interest for a longer amount of time.

Remember that you don’t have to make every area of your landscape bloom in every single season. By creating these seasonal flower and plant groupings you can bounce the interest around your landscape and change the focal point and even the color scheme as the seasons change. It’s a really fun way to make your landscape unique and ever-changing from week to week, month to month and season to season.

creating seasonal flower and plant groupings

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