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Garland chrysanthemum has a simple annual rhythm once you accept that it does not belong in summer. There are two sowing windows, one either side of the hot months, and they produce quite different crops. The autumn window gives long, steady picking from plants that have no reason to flower. The spring window gives a short burst before heat and lengthening days end it. Planning around that difference removes most of the disappointment people have with this crop.
| Season | Main job | What decides success |
|---|---|---|
| Late winter to early spring | Sow as soon as the soil is workable and above 50F (10C) | Getting the sowing in early enough to beat the heat |
| Spring | Thin twice, pinch, pick tips every two weeks | Steady moisture and honest thinning |
| Early summer | Cut the last of the spring crop; let a few plants flower | Cutting before the buds form, not after |
| Midsummer | No sowing; clear the ground and let it rest | Resisting the urge to sow into hot soil |
| Late summer | Sow the main crop once the heat breaks | Keeping the seedbed damp through slow germination |
| Autumn | Pinch, pick tips, feed lightly after each cut | Picking often enough to keep new shoots coming |
| Early winter | Pick under cover; take a final hard cut before hard frost | Row cover or a low tunnel on the coldest nights |
The spring crop is a race
Sow as soon as the soil is workable and has come up above 50F (10C). Germination will be slow, perhaps two to three weeks, which is normal and not a reason to resow. Every week you gain at this end of the season is a week of picking at the other end, so an early sowing under row cover or a cloche is genuinely worth the trouble.
Thin twice, pinch the leader at five inches (13 cm), and start picking tips as soon as the side shoots are four inches long. Expect two or three cuts before the plants stiffen. Watch the growing points closely from the point at which daytime temperatures start regularly passing 70F (21C), because the change from soft to stringy takes only a few days.
When the first buds appear, cut everything usable across the whole row in one go rather than picking over it. The leaf quality on the remaining shoots is already falling and there is nothing to be gained by waiting. Then clear the row and put something else in the ground, or leave a few plants standing to flower.
The autumn crop is the one that matters
This is where the crop earns its place. Sowing once the worst heat has passed puts the whole growing period into shortening days and cooling nights, which is precisely the opposite of what triggers flowering. Plants stay soft and productive for two or three months and keep going into light frost.
- Sow as the heat breaks Wait until the soil has come back below 75F (24C). Sow shallow, keep the surface damp for the full two weeks it may take to emerge, and sow a short row again two and three weeks later.
- Thin, then pinch Thin to two inches at two true leaves and to final spacing at four inches tall. Pinch each plant's leader once it reaches five inches so it branches out.
- Pick every two to three weeks Take the top three to four inches of each shoot, always cutting above a leaf pair. Water and give half-strength liquid feed the same day.
- Cover before the first hard frost Light frost improves the flavor and the plants shrug it off. A hard freeze does not. Row cover or a low tunnel over the row extends picking by several weeks in most gardens.
- Take a final hard cut When regrowth has clearly stopped, cut everything down and use it. Leave a few plants standing if you want flowers and self-sown seedlings the following season.
Midsummer, and what to do with the gap
There is no useful summer sowing. Seed germinates badly above 80F (27C), the seedlings that do appear stretch and bud at six inches, and the leaves are harsh even before flowering starts. Growers who insist on a summer row usually conclude that they simply do not like the taste of this plant, when what they have actually tasted is a heat-stressed one.
Use the gap. The ground that carried the spring crop will take a fast summer crop and be free again in time for the late summer sowing. If you would rather not replant it, a shallow mulch of compost over the empty bed keeps the surface soil alive and gives you a fine, damp, crumbly seedbed exactly when you want it, which matters more for this crop than for most because of how shallow the seed has to be sown.
If you must have leaves through the hot months, sow in the shade of a taller crop such as sweetcorn or trellised beans, water daily, and expect one cut before the plants bud. Treat it as a bonus rather than a plan.
The records that make next year easier
Four dates per row are enough to make the following season noticeably better: the sowing date, the emergence date, the date of the first cut, and the date you first saw a flower bud. The first two together tell you how long germination really takes in your soil, so you stop resowing prematurely. The last two together give you the length of your own picking window.
Add the bed position and whether the row had afternoon shade, and note the date of your first light frost and your first hard freeze. Over two seasons those figures let you fix your own late summer sowing date precisely, which is the single decision that determines whether this crop gives you three months of picking or three weeks.