Cutting Garden: Growing Flowers for Bouquets

A cutting garden is for growing flowers for bouquets, so it uses a separate bed of zinnia, cosmos and dahlia that you can pick without spoiling the display.

A good cutting garden is planted like a vegetable plot and harvested like one: close rows, hard pinching, cutting every few days and sowing again before the first batch finishes. A bed of 1.2 by 3 m (4 by 10 ft) will usually keep one household in vases from early summer to frost if you manage succession. This guide covers the production layout, pinching, the correct cutting stage for each flower, succession timing and the conditioning steps that decide vase life.

It sits in the Flower Gardening guides. For the choice between annual and perennial stock, see Annuals vs Perennials, and for plants you don’t want to raid, build a display bed using Low-Maintenance Flower Borders.

Cutting garden at a glance

Lay it out for production, not looks

A cutting bed breaks the border rules. Plants sit closer than they would in a display bed because every stem is going to be removed before the plant gets big, so there’s less mature foliage to compete. Plant in single rows, or double rows 20 to 30 cm apart for zinnias, cosmos and snapdragons, and leave a stepping line so you never walk on the soil.

Closer spacing has a cost. Air moves less between plants, and powdery mildew on zinnias and rust on snapdragons are the usual penalty in humid summers. If your climate is damp, widen to the top of the ranges and pick mildew-resistant zinnia types such as the Profusion or Zahara series.

1. Prepare the soil. Loosen it to a spade’s depth and fork in 5 cm (2 in) of compost. Cutting flowers are heavy feeders compared with border perennials. Not sure about your soil? Understanding Your Soil Type explains the jar test.
2. Stretch the netting first. Fix the first layer at about 30 cm on stakes before planting so seedlings grow up through it. Add a second layer at 60 cm for cosmos, larkspur and sunflowers.
3. Mulch the paths and rows. Straw or shredded leaves hold moisture and stop soil splashing onto low blooms.
4. Water at the base. Wet foliage encourages mildew. A drip line down each row is the simplest option (see Drip Irrigation and Smart Watering).

Pinching: the step that doubles your stems

An unpinched zinnia or cosmos makes one tall stem with a big terminal flower, then side shoots of variable quality. Pinching removes the growing tip above the third or fourth pair of leaves, which forces side shoots from lower nodes. Those shoots are longer, straighter and more numerous.

Pinching delays the first flowers by about one to two weeks, so pinch half your plants and leave the rest. That staggers harvests as a side benefit.

Cut at the right stage

Vase life is largely decided when you cut. Flowers that keep developing after cutting should go in at bud stage, while those that don’t should be fully ready.

Cut long, just above a leaf joint or branch, so the plant makes new shoots below the cut. Cutting short stems from the top of a plant leaves nothing to rebranch from. Foliage and fillers lift a bunch from garden-looking to florist-looking: bronze fennel, dill, mint, grasses such as Panicum or Pennisetum, and shrub prunings all work, and they give the sparse stems of ammi and snapdragon something to lean on.

Succession sowing and the end of the season

Fast annuals bloom about 8 to 12 weeks from sowing and then decline over three to four weeks. Sowing a new row every two to three weeks therefore gives continuous production. Stop when the crop wouldn’t flower before the first expected frost, which means counting back about 10 to 12 weeks from that date. Find your frost dates in The Seasonal Planting Calendar.

• Early spring: hardy annuals (ammi, larkspur, calendula, cornflower) outdoors or under cover, and half-hardy types indoors 6 to 8 weeks before the last frost.
• Late spring: plant out zinnia and cosmos once nights stay above about 10°C (50°F), and dahlia tubers once frost has passed.
• Summer: sow zinnia, cosmos and sunflower every 2 to 3 weeks.
• Autumn: sow hardy annuals in mild-winter regions, and plant spring bulbs for early stems (bulb timing is in the guide linked under Next steps).

Conditioning and vase life

Bacteria in the water block stem ends and are the main reason cut flowers fade early. Everything below is about keeping stems clean and hydrated.

1. Cut into a clean bucket of cool water. Wash buckets with dish soap between uses.
2. Strip lower leaves so none sit below the waterline.
3. Re-cut stems at an angle before arranging, removing 2 to 3 cm.
4. Rest them for 2 to 4 hours in a cool, shaded room before arranging.
5. Use flower food in a clean vase if you can. It supplies sugar and an acidifier. Change water every 2 days.

Some flowers need extra care. Woody stems such as hydrangea and lilac last longer if you split the stem base up to 2 to 3 cm. Poppies and euphorbias bleed sap, which seals the stem. Dip the cut end in boiling water for 7 to 10 seconds.

Keep vases away from heat, direct sun and fruit bowls, since ripening fruit gives off ethylene gas. Zinnias and basil dislike chilling, so store them in a cool room around 10 to 15°C rather than the fridge.

Diagnosing problems

What a cutting garden needs to keep flowers coming

Zinnia, cosmos and dahlia flower more when you cut them, because picking stops seed setting and boosts new buds. Full sun and a rich bed fed with compost and potash support long stems, while shade and heavy nitrogen encourage leafy growth. Stake or netting holds tall sunflower and dahlia upright and prevents wind damage.

Cutting in the cool of the morning reduces wilt, and a bucket of clean water protects the stems on the way indoors. Succession sowing of cosmos and zinnia controls gaps, since each sowing flowers at a different time. Mulch holds moisture and reduces weeds between rows, and a drip line delivers water without wetting the blooms that powdery mildew attacks. How deep should the stems go in the vase? Strip leaves below the water because they encourage bacteria, and you’ll find flowers last far longer with clean, cool water.

What a cutting garden needs to keep bouquets coming

Zinnia, cosmos and dahlia flower more when you cut them, because picking stops seed setting and boosts new buds. Full sun and a rich bed fed with compost and potash support stems of 40 to 60 cm, while shade and heavy nitrogen encourage leafy growth with fewer flowers. A stake or netting holds tall sunflower and dahlia upright and prevents wind damage.

Cutting in the cool of the morning reduces wilt, and a bucket of clean water protects stems on the way indoors. Succession sowing of cosmos and zinnia every 3 weeks controls gaps, since each sowing flowers at a different time. Mulch 5 cm deep holds moisture and reduces weeds between rows, and a drip line delivers water without wetting the blooms that powdery mildew attacks. Strip leaves below the waterline because they encourage bacteria, and you’ll find flowers last far longer in clean, cool water changed every 2 days. Aphid attracts ladybird, so a few marigold near the dahlia control pests without spraying. Your extension service lists varieties for your frost dates, and flower bulbs extend the season.

Dahlia needs staking and feeding with potash every 2 weeks, because heavy blooms break stems in wind and nitrogen encourages leaves instead of flowers. Sunflower and zinnia tolerate heat, while sweet pea needs a trellis and cool roots under a layer of mulch. Slug and snail damage young dahlia shoots in spring, so a beer trap or copper tape controls them. Deadheading cosmos weekly boosts flowering for 12 weeks, and aphid attracts ladybird that protects the whole bed.

Common mistakes

• Treating the cutting bed as a border. Spaced-out plants waste ground and make too few stems. Plant in close rows and accept that you’ll replace them.
• Waiting for every bloom to be perfect. Flowers left to age shift the plant into seed production. Cut often.
• Cutting zinnias or dahlias in bud. They won’t open. Use the wiggle test for zinnias, and cut dahlias fully open.
• Using a dirty vase. Bacteria clog stems. Scrub the vase with soap and rinse well.
• Sowing everything on one day. You get three weeks of glut then nothing. Stagger sowings.

Dahlias are one of the best cut flowers, and you can learn their care in How to Grow Dahlias.

For how to choose a support for climbers, see Best Trellises & Plant Supports.

Next steps

Feed the insects that visit the bed with Flowers That Attract Pollinators, plant early-season stems from Flower Bulbs 101, and add long-lived rose stems with How to Grow Roses. Back to Flower Gardening.