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A garden grown specifically for cut flowers needs a different approach than a flower garden grown for aesthetics. Cut flowers get harvested hard and often, which may sound contradictory, but it's what keeps most of them producing. If you grow cosmos and leave them alone, they'll bloom, set seed, and start shutting down flower growth by midsummer, because seed production is the entire point as far as the plant is concerned. The same plant, cut every few days, keeps pushing out new stems and flowers until frost takes it down.
What Makes A Good Cut Flower
A pretty flower is not automatically a good cut flower. The first thing to look at is stem length, since anything under about 12 inches leaves nothing to arrange with, even when the bloom itself is perfect. How long a stem lasts in water matters just as much, and it varies from a few days with poppies to a week or more with zinnias.
Don't use a wildflower mix because it's designed to be ground cover and for pollinators, so most of what comes up stays low to the ground with shorter stems.
Best Flowers For a Cutting Garden
Zinnias
If there is room for only one flower, make it a zinnia. They bloom about 75 to 80 days after sowing, handle summer heat well, and last seven to 10 days after being cut. Regular cutting makes them branch, so when you cut one stem, this turns into two or three more. Dahlia-flowered and Lilliput mixes have lots of color and are great beginner zinnias.
Cosmos
Cosmos are easy to grow and produce for months. The feathery foliage does double duty in a flower arrangement because it is good filler and pretty. The tradeoff is overall vase life. Cosmos lasts about five days, and its thin petals bruise easily, so treat it carefully.
Branching sunflowers
Branching sunflowers provide great multiple harvests. A single-stem giant such as Mammoth Grey Stripe makes one large flower, then the blooming is over. Branching types such as Autumn Beauty send out side stems for weeks and can produce several usable flowers per plant. Cut them as the petals begin to lift from the center disc, before they start shedding pollen, or they may leave your tablecloth covered in pollen.
Snapdragons
Snapdragons take more planning because they need an early indoor start. But they look incredible, and the tall spikes last seven to 10 days in a vase. Cut snapdragon blooms when the bottom two or three florets are open. The rest will open in the vase. Keep the stems upright after cutting because if they're laid flat, the tips will curve upwards and stay that way.
Other good choices
Bachelor buttons and calendula bloom early, when warm-season flowers are still getting started. Calendula is a great cutting flower, but it works best in short arrangements because its stems aren't very long. Black-eyed Susan, Gloriosa daisy, and French marigold are all sturdy, pretty cutting flowers. Marigolds are a good choice, but their foliage has a strong smell, so use them sparingly.
Perennial Cutting Flowers
Perennials are great in a cutting garden, but they take longer to establish. Purple coneflower, Russell lupine, and painted daisy will return every year, but during their first season they'll be making roots and leaves rather than flowers. They are best planted in a separate border, not in the annual bed that gets cut hard every few days.
- Purple coneflower (echinacea): Strong stems, long vase life, blooms from midsummer to frost once established.
- Russell lupine: Tall spikes for a few weeks in early summer, then done for the year.
- Painted daisy: Early summer bloom on stiff stems, with ferny foliage that works as its own filler.
- Foxglove: A biennial that flowers the second year. The whole plant is poisonous, which is worth noting for anyone with small kids or pets.
- Lavender: Cut the stems before the florets fully open. It holds well fresh and dries wonderfully.
Fillers and Foliage
What separates a homemade bouquet from a florist one is rarely the flowers; it is everything around them. Filler creates air between the larger blooms, and foliage gives the arrangement depth and structure. A cutting garden planted with nothing but showpieces tends to look like everyone arrived at the party wearing the same hat.
The standard filler is baby's breath. The annual baby's breath grows fast and blooms roughly two months after sowing. It is short lived though, and will stop blooming a few weeks after it starts. The best approach is to sow it again every two or three weeks to keep a supply coming.
Dill flowers are excellent filler because their loose yellow-green umbels last well in water. Mature basil is also a great filler. As it matures, its stem gets firmer and can hold up in a vase. It also makes the room smell good. Short-stemmed herbs like borage and chamomile are nice fillers for shorter cut flower arrangements since their stems aren't super tall. Using tall nasturtiums long enough to drape over the edge of a bowl will add texture and depth.
Starting A Cut Flower Garden
A bed sown all at once flowers all at once and will look tremendous in July but then empty by the end of August. The solution is to sow the same flowers in rounds two to three weeks apart, so a fresh set of plants comes into production as the first set slows down. This matters most for anything with a short productive window, like the single-stem sunflowers that give one bloom per plant and nothing after it.
Work backward from the average first fall frost. Zinnias need about 75 days from seed to bloom, so the last useful sowing day is about 90 days before that frost. The extra time allows for slow germination and cool weather. Later sowings can still be fun, but they might not bloom in time.
Cold-tolerant flowers such as bachelor buttons, calendula, poppies, and snapdragons can handle chilly spring weather. Zinnias, cosmos, sunflowers, marigolds, and nasturtiums need warm soil, around 60 to 70°F.
How To Keep The Flowers Producing
The key to continuous flowers is continuous harvesting. Pinch the flowers from zinnias, cosmos, snapdragons, marigolds, and branching sunflowers when they reach 8 to 12 inches tall. Remove the top few inches just above a pair of leaves. When you pinch them off like that, it forces side branches, and side branches make more long stems than one thick central stalk ever will.
Deadhead anything you don't cut on the same schedule, because even one flower left to set seed tells the whole plant its work is finished and it will stop making flowers entirely.
The best time to harvest is early morning, while the stems are still full of water from the cool night and before the sun starts pulling it back out. Evening is the next-best option. When flowers are cut midday in July, they often wilt before they reach the house, and some never recover.
Carry a clean bucket of water into the garden. After cutting, put each stem straight into the water. Then cut the stem low, down to a strong pair of leaves or a visible side bud.
Learn the right harvest stage for each flower. Zinnias have a wiggle test: the stem will stay stiff about eight inches below the bloom when you shake it gently. Cut daisy-shaped flowers such as black-eyed Susan when they are fully open because they do not continue opening in the vase. Remove any leaves that sit below the waterline because they can rot and encourage bacteria to grow, which can then prevent the stems from getting water.
Flowers That Need Special Handling
A handful of flowers wilt no matter how carefully they were cut, but for each one there is a solution.
- Poppies: cut at the cracked-bud stage, when the outer shell has just split, and the color is showing. Then sear the cut end in a flame or dip it in boiling water for 7 to 10 seconds. If you trim it later on, it'll need searing again.
- Branching sunflowers: cut them the day the petals lift off the disc, before the pollen sheds.
- Snapdragons: keep the stems upright in the bucket and in storage. If you lay them flat, the tips curve upward within a few hours and stay bent.
- Basil and other soft stem plants: use room temperature water and don't put them in the refrigerator, because that turns the leaves black.