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Idemar, organic seeds



Over the years, we have tried several varieties of Brussels sprouts. Most Central European varieties barely have time to form firm heads here in zone 3, so we have long been looking for a variety that gives a good harvest. Idemar struck us with amazement. Lots of perfect, round to slightly oval, normal sized heads on medium tall plants.

Like all Brussels sprouts, Idemar tolerates a lot of frost and overwinters easily if the wetness is not too severe.


Product number:5210
Scientific name:Brassica oleracea var. gemmifera
Botanic family:The Mustard Family - Brassicaceae
Days to maturity:90
F1 Hybrid:No
New variety:No
Sowing time:Pre-cultivate: March–May
Sowing depth:1 cm
Germination temperature:18-25 °C
Germination time:4-7 days
Plant spacing:45-60 cm
Row spacing:70 cm
Height:60-80 cm
Plant location:Sun–Half shade
Seeds/g:200–300 seeds
Heirloom variety:No

Cultivation advice


Sow thinly indoors or in a hotbed, about 1cm deep, 4-6 weeks before setting out the plants as planned! The seeds want warmth when germinating, preferably just above 20°C. After sprouting they should be in a light, cool and airy place to avoid lankiness and attacks by root-neck rot. Temper the plants gradually before setting them, when the risk of frost is just about over. Most kinds of cabbage can handle a night of light frost. Set out the seedlings a little deeper and tread down the soil preventing the cabbage flies laying their eggs. Many early sorts can be sown directly as soon as the soil has warmed up. Do not allow the sowing to dry out and look out for the flea-beetles.


Keep 45-60 cm between the plants and up to 70 cm between the rows. Ample space makes stronger plants, bigger heads and earlier harvest.


The Brussels sprouts are hardy and their flavour increases after a few really good nights of frost. It can remain outdoors through the whole winter and in northern Sweden too where the snow protects it against too severe cold. If one wishes to harvest all the roses at one time, one can lop off the plant, when the roses farthest down are 1.5 cm in diameter. The development then becomes more even and earlier too but their hardiness in winter gets worse without protection from the top ofthe plant. The tops are a veritable delicacy, when lightly poached. Break off the leaves when you are harvesting gradually as that aids the development of the remaining heads. Brussels sprouts have limited keeping qualities. Freezing is one way of storing them. One possibility is to hang whole plants, roots up, in a damp, cool cellar, they will then keep for several weeks.


200-300 seeds/1 g. 8 g yield 1000 seedlings.
A portion contains about 50 seeds.