Growing Saffron Crocus: Planting, Care And Use

It is the most expensive spice in the world – saffron. We will show you whether and how you can grow this extraordinary spice in your own garden. Saffron ( Crocus sativus ) is not only used to flavor dishes but also to refine them. A single gram of the valuable spice costs 10 to 20 euros, depending on the quality. The autumn crocus also thrives in our latitudes, even if it cannot be harvested often. We give tips on planting, caring for, and using the saffron crocus.

Saffron Crocus: Origin And Properties

The perennial saffron crocus from the Iridaceae family has its origin in the Aegean Sea. It is mainly grown in warm Mediterranean regions and the Middle East. Saffron came about by chance from a mutation of the related crocus species Crocus cartwrightianus. On the one hand, larger flowers developed, on the other hand, significantly longer and larger stylus threads on which the stigmas are located. It is precisely these characteristic, long, deep red saffron threads that are relevant for saffron cultivation.

They contain a slightly bitter, spicy saffron aroma and a strong coloring power. These saffron threads form during the flowering of the purple autumn crocus from October to November. However, the sensitive styles cannot tolerate temperatures below 15 ° C, and so the saffron spice can actually only be harvested in very mild wine-growing regions. In all other areas, however, it is worth planting saffron simply because of its ornamental value, the low maintenance requirements, and the late flowering period, which reminds us of the past crocus bloom in spring.

Saffron is a species of autumn crocus and blooms from October

Growing saffron

Growing the precious saffron plant is not easy because it places high demands on its location. The cultivation of the expensive spice can, in individual cases, also be successful in sheltered and warm locations in our home gardens. To be able to harvest a considerable amount at all, however, around 150 flowers would have to be grown for 1 g of dried saffron threads.

The right location for saffron

Saffron plants prefer dry, sunny locations on loose, sandy, and calcareous soils. Waterlogging must be avoided at all costs, otherwise, the tubers and roots rot quickly in the earth. Whether in a pot or bed, the saffron crocus prefers to be sheltered from the wind and warm. This increases the chance of being able to harvest the stylus threads in autumn. For this purpose, the autumn crocus needs constant temperatures of around 15 ° C during flower formation, even in September and October.

Planting saffron

Saffron is only propagated vegetatively, so small saffron tubers are planted directly in the ground. The small tubers can be planted directly in the ground or a pot from July to the end of August. For the cultivation of saffron in the pot, the planter should be sufficiently large, this makes fertilization easier later. The pot should hold at least 10 liters for a single tuber that also multiplies underground in late autumn and forms daughter tubers. Nutrient-rich potting soil is particularly recommended for potting.

Instead of climate-damaging peat, we recommend soil with a high compost content that stores moisture and provides nutrients over the long term. The potting soil should be enriched to at least 30% with sand, perlite, lava fragments, or coarsely broken bricks. A drainage layer of at least ¼ the height of the pot should be filled in at the bottom of the pot. Broken bricks, expanded clay, or pebbles, for example, are suitable for this.

The saffron crocus can be planted about 15 cm deep from July to the end of August

The saffron tubers are placed at a depth of 15 cm, whereby the plant tubers should be about 15 cm apart. To protect the tubers from voles, a vole basket can also be used when planting.

Maintain saffron crocus

After planting, the saffron does not initially need any watering, because the tubers contain enough water for root formation and budding. In the further culture, occasional watering in extreme heat and drought in late summer September is sufficient to supply the tuber for the energy-sapping flower formation. In the rest period from May to August, the saffron does not want to be watered at all, because it now has neither leaves nor flowers.

If saffron is cultivated in pots, an annual dose of mainly organic slow-release fertilizer, provides the necessary nutrients for a splendid bloom and strong green leaves. The fertilizer can either be introduced each spring when repotting or simply worked flat into the surface of the potting soil with a fork. Even when growing in natural soil, some organic fertilizer can be buried in spring.

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The saffron should be relocated or repotted about every three to five years. Digging and moving should be done during the rest period from April to September. The chive-like leaves remain in place in winter and, depending on the temperature and weather, do not move in until April.

Tip: The saffron plant is perennial and will delight you for many years with good care. However, it is also self-intolerant. There should be a 10-year break in cultivation in the same area before new saffron is planted.

Propagate saffron

The approximately 10 to 15 cm high iris family has a triple set of chromosomes due to its unusual genetic origin and is therefore sterile, so it cannot form germinable seeds. Saffron cannot, therefore, be propagated through seeds, because there are no saffron seeds at all. The only possibility of propagation is via daughter tubers. After the saffron bloom in late autumn, the crocus forms vegetatively small tubers that have the same genetic material, i.e. they are natural clones of the mother plant. After the foliage has died in April, they can be dug up and repositioned one by one. If the conditions are good, the number of daughter tubers doubles every year and so the saffron can be multiplied quickly.

Hibernate saffron crocus

The relatively hardy saffron crocus tolerates temperatures down to -10 ° C in the soil, at lower temperatures it becomes critical. A cover made of fir branches or a thick layer of leaves can provide additional protection against cold temperatures. Saffron bulbs planted in pots should be wintered in the house frost-free, but absolutely cool and with only a few waterings.

Daughter tubers from around the mother tuber and can be transplanted from May to August

Saffron as a Spice: Use and Ingredients

Saffron has a strong flavoring and coloring power, so it should only be used in moderation when cooking. The threads contain the three main components crocin, picrocrocin, and safranal. The latter is largely responsible for the typically smoky-spicy taste of saffron. Crocin and other vegetable dyes, such as xanthophylls and carotenoids, color rice and pasta dishes, liqueurs, cosmetics, and baked goods, for example, sun yellow.

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If overdose, however, the bitter substances contained in saffron quickly emerge and a daily dose of 1.5 grams can lead to hallucinations, cramps, and even death. This amount is never exceeded if the saffron is only used as a spice in the kitchen. In folk medicine, the expensive spice is used as a remedy to this day. The effect of saffron is mood-enhancing, calming, digestive, and anti-feverish and it is an important component of the Swedish herb elixirs.

Tip: saffron is slightly poisonous. In the tubers of saffron, just like in the stigma of the flower, there are inedible substances. The plants should therefore not be consumed.

If the planting and care are successful, the autumn crocus rewards us in October with its deep purple flowers and the pretty saffron threads. If you are lucky and have a very green thumb, it will then be time for the saffron harvest and the subsequent drying and storage. Find out more about this in our special article.

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