Harvesting sloes: harvest time & processing

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Not only birds like to taste the berries of the sloe, we humans can also benefit from the fruits. We reveal when and how to proceed with the harvest and how best to process sloes.

Blackthorn berries in bowl next to liquor glass
Sloes can be processed into many delicacies. To do this, they have to be harvested first [Photo: Bozhena Melnyk / Shutterstock.com]

Sloes (Prunus spinosa) often grow wild and can be found on many roadsides, slopes or hedges. Birds love the black and blue berries and find plenty of food on the bushes in autumn. But humans can also use and process the healthy berries of sloe. In this article, we'll tell you when it's best to harvest sloe, how to do it and what delicious things can be made from sloes.

contents

  • The right time to harvest sloes
  • Harvesting sloes: this is how you pick them
  • Can you eat sloes raw?
  • Dry and freeze sloes
  • Process sloes: You can do this with the fruits
    • Sloe juice and syrup
    • Sloe wine, schnapps and liquor
    • Sloe jam

The right time to harvest sloes

When can sloes be harvested? Sloes are ripe when the skin is deep blue-black up to the base of the stem. This means that you can pick the first ripe sloes as early as autumn. One advantage of harvesting sloes early is that the chances are then greatest that not all of the fruits have been stolen by birds. Because birds love the fruits of the sloe. However, in autumn the berries still contain a lot of tannins and bitter substances, which do not make the fruits taste delicious. But that changes after the first frost. Because once the fruits are frozen through, their cell walls become more permeable and the starch is converted into sugar. At the same time, the tannin content decreases. As a result, the fruits taste milder. Sloes should therefore be harvested between the end of November and mid-December.

Tip: If you don't want to share your sloes with birds, you can also harvest the fruits in autumn and then put them in the freezer. The fruits have experienced an artificial first frost and also taste milder.

Blackthorn berries covered with frost
Sloes are best harvested after the first frost [Photo: Bogdan Vacarciuc / Shutterstock.com]

Harvesting sloes: this is how you pick them

Sloes are not called sloe thorns for nothing: The branches are very prickly and covered with many thorns. Picking sloes is therefore not that easy. It is therefore advisable to wear gloves and long-sleeved clothing when harvesting. The berries are then picked from the branch one at a time.

Can you eat sloes raw?

The rumor persists that sloes are poisonous when raw and therefore cannot be eaten fresh. This is only partially true, however, because sloes can very well be enjoyed raw - but only in moderation. The kernels of the sloe contain amygdalin. After consumption, this substance is converted into hydrogen cyanide by our body. This is very toxic to humans. However, the content in the small kernels of sloe berries is low, so you would have to eat huge amounts of sloes to poison yourself.

Attention: However, eating sloe raw is dangerous for children. You are not able to excrete the hydrogen cyanide. Therefore, consuming raw sloes in children can lead to nausea, vomiting and diarrhea and should definitely be avoided.

Quite apart from the fact that adults can safely consume raw sloes in small quantities, many people do not like raw sloes because they are bitter and astringent. However, this is mainly the case if the fruits have not yet suffered frost. However, it is worth trying the raw fruits once, as they are supposed to have antioxidant, anti-inflammatory, stomach-calming and digestive effects and are therefore very healthy.

Bird in sloe bush
Birds enjoy tasting sloe berries [Photo: Alan Tunnicliffe / Shutterstock.com]

Dry and freeze sloes

Sloes can only be kept fresh for a few days. It is therefore a good idea to process sloes soon. A simple way to preserve sloes is by drying or freezing. Sloes are best dried in the oven or in a dehydrator. You can then enjoy the dried fruits as a snack, for baking or in muesli. To freeze sloes, wash and dry the fruit, then place them in freezer bags. In this way, the fruits can be kept in the freezer for several months.

Process sloes: You can do this with the fruits

Sloes are extremely versatile and there have been numerous recipes with sloes for centuries. The classic is of course the sloe liqueur, but jam or juice made from sloe also taste delicious and are healthy.

Sloe juice and syrup

Sloe juice can be easily made from sloes, water, sugar and lemon juice. The juice contains plenty of vitamin C, flavonoids as well as tannins and bitter substances. The latter in particular are very healthy and have a diuretic and appetizing effect and help with cystitis. Sloe syrup has similar properties and can be boiled down from sloes with water, sugar and lemon juice.

Sloe wine, schnapps and liquor

If you like it a little alcoholic or even high-proof, you will surely like sloe wine or sloe liqueur. Sloe wine is prepared with water, sugar and fermentation yeast in a wine balloon and can be fermented either tart and similar to red wine or sweet like a dessert wine. To make sloe schnapps, you need a distillation system and some knowledge of how to make schnapps. However, it is easier to prepare sloe liqueur yourself. Sloe liqueur is also called sloe fire or sloe gin and is made up with sugar and gin, rum, vodka or grain. If you like, you can season the whole thing with cinnamon, cloves or star anise.

Blackthorn berries liqueur
A classic among the recipes with sloe is the sloe liqueur [Photo: Oksana_Schmidt / Shutterstock.com]

Sloe jam

Sloe jam tastes delicious and is a great way to preserve the fruit. The preparation is very simple: only sloes are boiled down with preserving sugar in a ratio of one to one.

Everything about the Cultivation of sloes You can read about it in our special article in your own garden.