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A perennial gypsophila is late to wake, quick to run up, spectacular for six to eight weeks in the middle of summer and then quietly dormant for the rest of the year. An annual compresses that whole story into about three months from sowing. Because the perennial disappears completely in winter and reappears late, most of the year's work is done in two short spells: early spring and early autumn.
Work from your own frost dates and soil temperature rather than from months, so the plan reads correctly wherever you garden. The two anchors are the soil reaching 60F (15C), which is when to sow, and the first frost, which ends the annuals.
Nothing here involves feeding. The gypsophila year has no fertilizer in it at all, and the jobs that replace it are liming, gritting and keeping water away from the crown.
| Point in the season | Main job | The judgement to make |
|---|---|---|
| Late winter | Test pH, order seed | Below 6.8 means lime before growth starts |
| Early spring | Surface lime, top up the grit collar | Do not dig around established crowns |
| Early spring | Take basal cuttings at 3 in (8 cm) of new growth | Take with a heel; do not divide the plant |
| Mid spring | Set supports at 18 in (45 cm) | Before the shoots reach a foot, not after |
| Once soil is above 60F (15C) | Sow annuals direct, first row | Sow where they are to flower; do not transplant |
| Every 3 weeks to midsummer | Sow the next short row of annuals | This is what keeps cut flowers coming |
| Early summer | Check tips for aphids weekly | Squash early, then leave predators a week |
| Midsummer | Cut sprays at half open | Cut low, to a fork, in the morning |
| After the main flush | Shear the perennial back by a third | Often gives a lighter second flush |
| Late summer | Leave a few plants to set seed | Wait until the capsules are papery brown |
| Early autumn | Clear soft mulch and debris from every crown | This is what decides winter survival |
| First frost | Pull the annuals, mark the perennial crowns | Leave 3 in (8 cm) of stem above each crown |
Early spring: lime, grit and supports
The most valuable half hour of the gypsophila year is spent in early spring, before the crowns break. Test the pH and scatter garden lime on the surface if it has fallen below about 6.8, water it in, and top the gravel collar around each crown back up to half an inch (12 mm). Pull away any leaf litter or compost that has drifted against the base over winter.
Put supports in now. A ring or a grid of string between short stakes at about eighteen inches (45 cm), or pea sticks pushed in round the crown, set while the new shoots are only six to nine inches (15 to 23 cm) tall. Once the plant is up you cannot stake it without spearing the taproot, and the flowering cloud is far too heavy to prop up after rain has flattened it.
This is also the moment for basal cuttings if you want more plants, taken with a heel from the young shoots as they reach three inches (8 cm). It is the only reliable way to increase a perennial, since division kills it.
Sowing season: one row after another
Once the soil holds above 60F (15C), sow the first short row of annuals a quarter inch (6 mm) deep into limed, gritty ground, and then keep sowing another row every three weeks until midsummer. Each row gives four to six weeks of flower and then finishes for good, so the succession is not an optional refinement; it is how the plant is grown for cutting.
Thin each row to six to nine inches (15 to 23 cm) as soon as the seedlings have two or three true leaves, cutting the surplus off at ground level rather than pulling. The two weeks after germination are when slugs take a row out overnight, so water in the morning and check with a torch after dark for the first couple of nights.
Perennials are sown once, into their permanent place, at the same soil temperature. They will make foliage and a taproot this year and flower properly next summer, which is the correct outcome and not a failure.
Keep a simple list of sowing dates and the date each row came into flower. After one season you will know exactly how many days your own conditions need, and you can set the interval so a new row opens as the last one goes over.
Summer: cutting is the whole job
From the first open sprays to the end of the flush, cutting is what the plant wants from you. Take sprays when about half their flowers are open and the rest are still buds, in the morning after the dew has gone, cutting low to a branching fork rather than snipping off the surface. Cutting to a fork makes the plant branch and throw more stems, so a plant cut regularly flowers more than one left alone.
Bundle anything for drying in loose handfuls no thicker than your fist, bound with a rubber band so the tie tightens as the stems shrink, and hang them upside down in a dark, dry, airy place for two to three weeks. Sunlight bleaches a drying bunch to straw within days, so darkness is not optional.
Otherwise, do nothing. No feeding, no watering except in genuine drought, no overhead watering onto the crown at any time. Check the tips for aphids weekly, thin any congested growth in the middle of a big plant to keep air moving, and leave the rest alone.
Autumn: the jobs that decide next year
After the main flush, shear the perennial back by about a third to take off the spent flowering stems. Many plants respond with a lighter second flush, and even where they do not, the plant goes into the wet season without a mass of dead stems lying over its crown.
In early autumn, go round every crown and clear soft mulch, fallen leaves and dead foliage a hand's width back, then refresh the grit. This is the job that decides whether an established plant is there next spring, and it takes minutes. At the same time, check the pH and lime the surface if it has slipped.
Leave three or four inches (8 to 10 cm) of stem standing above each crown over winter rather than cutting flush to the ground, and push a short cane in beside each plant. Gypsophila appears very late in spring, and a marked position stops a live crown being forked out of an apparently empty gap. Pull the annuals once frost has finished them, saving seed first from the two or three plants you left to ripen.
Record which crowns you cleared and marked, and note in spring which ones came back and how late each appeared. Winter losses cluster in the wettest corner of a bed, and two years of that record shows you exactly which spot to stop planting into.