October is one of the most exciting months for anyone growing Crocus sativus. After planting your saffron corms – often referred to as saffron bulbs – in late summer or early autumn, this is the time when the first green shoots and eventually the first purple flowers can start appearing above the soil.
But what if nothing has appeared yet? Will every corm flower? And should you water your saffron now?
In this guide, we explain what normally happens to Crocus sativus during October, what determines when flowering starts and how to care for your plants during their first autumn.
What happens to Crocus sativus in October?
Although Crocus sativus appears inactive during summer, important processes have already taken place inside the corm.
During the warm summer period, the flower buds develop inside sufficiently large corms. As temperatures begin to fall towards autumn, the corm enters the next stage of its annual growth cycle.
Roots and shoots start developing and the already formed flower buds begin to grow towards the soil surface.
This is why temperature is so important for Crocus sativus. A sufficiently warm summer helps prepare the corm for flowering, while the cooler conditions of autumn help trigger the next stage of growth.
Depending on climate, planting date and weather conditions, the first flowers usually appear from around mid-October onwards. In some regions flowering may start earlier, while in cooler conditions it can continue well into November.
So if your Crocus sativus has not flowered at the beginning of October, there is usually no reason to worry.
Don't expect every corm to flower at the same time
One of the most common questions we receive in autumn is why some Crocus sativus corms are already flowering while others have not yet appeared.
This is completely normal.
Flowering does not start simultaneously across an entire planting. Even corms growing next to each other can emerge several days apart. During the main flowering period, new flowers may appear almost every day for several weeks.
Weather also has a major influence. Cooler temperatures can slow emergence, while suitable autumn temperatures may suddenly cause a large number of flowers to appear within a short period.
Will every Crocus sativus corm flower in the first year?
No. Whether a Crocus sativus corm flowers during its first autumn depends strongly on its size. You can read more about the influence of corm size in our complete Crocus sativus growing guide.
A larger corm contains more stored reserves and can support more flowers. Smaller corms generally produce fewer flowers during the first season and concentrate more of their energy on vegetative growth and producing new daughter corms.
As a general indication under normal growing conditions:
- Size 7/8: little or no first-year flowering should be expected.
- Size 8/9: approximately 40–80% of the corms can flower in the first season.
- Size 9/10: normally capable of producing one or more flowers.
- Size 10/11: often around 2–3 flowers per corm.
- Size 11/+: generally 3 or more flowers per corm.
These figures are indications rather than guarantees. Planting date, summer temperature, soil conditions, rainfall and climate can all affect the actual result. You can also compare the different Crocus sativus corm sizes in our webshop.
This is also why smaller corms should not be judged solely by their first flowering season. With good growing conditions, they can produce larger daughter corms that flower much more strongly in subsequent years.
Both conventional and certified organic Crocus sativus corms follow the same annual growth cycle. The main difference lies in the cultivation method used to produce the planting material.
Should you water Crocus sativus in October?
Crocus sativus needs moisture once root and shoot development begins, but there is an important difference between moist soil and wet soil.
If autumn rainfall is sufficient, additional irrigation is usually unnecessary.
However, if the soil is dry and no rain is expected, watering after planting can help support root and shoot development.
Before watering, check the soil below the surface. If it is already moist, there is no reason to add more water.
Good drainage is extremely important. Crocus sativus does not perform well in soil that remains saturated for long periods, and excessive moisture around the corms increases the risk of rot and fungal problems.
During flowering, irrigate only when necessary. If possible, water after harvesting the flowers rather than soaking flowers that are ready to be picked. For more information about soil preparation, drainage and planting, see our saffron cultivation instructions.
What if you see leaves but no flowers?
Seeing green leaves without flowers does not automatically mean something is wrong.
Smaller corms can produce leaves without flowering during their first season. Larger corms may also produce leaves before their flowers appear, depending on growing conditions.
The narrow green leaves are an essential part of the plant's annual cycle. They remain active throughout autumn, winter and spring, producing energy through photosynthesis.
That energy is eventually used to develop and enlarge the new daughter corms underground.
So even when flowering is limited during the first autumn, healthy leaf growth is important for the following season.
Keep weeds away from your Crocus sativus
Once the Crocus sativus leaves emerge, keep the planting area as free from weeds as possible.
Weeds compete with the crop for water, nutrients and light. They can become particularly problematic during winter and spring, when the Crocus sativus foliage needs as much light as possible to support the growth of the new corms.
When the crop is above ground, remove weeds carefully by hand to avoid damaging the Crocus sativus leaves or disturbing the corms below the soil.
Protect your corms from mice and voles
Humans are not the only ones who appreciate Crocus sativus.
Mice and voles can cause significant damage because they may eat the corms underground. The damage is not always immediately visible and may only become apparent when individual plants fail to emerge or suddenly die.
If rodents are common in your area, placing suitable mesh over or around the planting bed can provide additional protection.
In areas with deer or hares, the green foliage may also need protection during winter.
The first purple flowers: time to harvest your saffron
Once flowering begins, check your Crocus sativus regularly.
During the peak flowering period, new flowers can emerge every day.
Each Crocus sativus flower contains three bright red stigmas. These are the parts that become saffron after drying.
For home growers, we recommend picking the flower when it has just opened, preferably in the morning and during dry weather.
Carefully open the flower and remove the three red stigmas. For high-quality saffron, use mainly the deep-red part and avoid including too much of the pale yellow or white style underneath.
Process the flowers as soon as possible after picking.
Don't forget to dry your saffron
Fresh saffron stigmas contain a considerable amount of moisture and should be dried on the same day they are harvested.
Drying is essential because this is when the characteristic aroma of saffron develops and the product becomes suitable for storage.
There are several ways to dry saffron. One practical method for small quantities is to spread the stigmas on baking paper and dry them gently in a controlled oven.
We normally recommend approximately 50–60°C for 15–30 minutes, depending on the amount of saffron and the type of oven.
The threads should feel dry and slightly crisp afterwards, without being burnt.
Once completely cooled, store your saffron in an airtight container in a cool, dry and dark place.
What happens after flowering?
Flowering may be the most spectacular stage of Crocus sativus cultivation, but for the corm itself the months after flowering are just as important.
The green leaves continue growing throughout winter and spring. During this period the plant produces and enlarges its new daughter corms.
For this reason, never cut off healthy green Crocus sativus leaves after flowering.
Leave the foliage untouched until it naturally turns yellow and dies back in late spring or early summer.
Especially during dry periods in spring, sufficient water is important because this is when the new corms are increasing in size. Larger daughter corms generally mean better flowering potential the following autumn.
October checklist for Crocus sativus growers
- Don't worry if your corms do not all emerge at the same time.
- Flowering normally begins from around mid-October but varies with climate and weather.
- Larger corms generally flower more strongly during the first season.
- Water if the soil is genuinely dry, but avoid permanently wet conditions.
- Keep the planting area free from weeds.
- Protect the corms if mice or voles are a problem.
- Check the crop regularly once flowering begins.
- Pick flowers when they have just opened.
- Remove the three red stigmas from each flower.
- Dry harvested saffron on the same day.
- Leave the green foliage untouched after flowering.
October is only the beginning
The autumn flowers may be what Crocus sativus is famous for, but they are only one part of a much longer annual cycle.
After its summer dormancy, Crocus sativus flowers in autumn and continues growing throughout winter and spring. During these months the foliage provides the energy needed to produce the new generation of corms underground.
These daughter corms will eventually replace the original corm and determine how strongly the crop can flower in future seasons.
So whether your first October brings just a handful of flowers or an impressive saffron harvest, the most important thing is to give the crop good drainage, enough light and the right care throughout the complete growing season.
For detailed information about planting depth, spacing, irrigation, fertilisation, harvesting and multi-year cultivation, see our complete Crocus sativus growing instructions.
