The onion 'Rijnsburger 4' has a long growing period. Early sowing, from March to mid-April at the latest, is therefore important. The onions can be stored well until spring, provided they are kept cool and dry. One bag is for approximately 15m2, and the planting distance is 30x10cm.

Onion 'Rijnsburger 4' produces beautiful round, straw-yellow onions, which are excellent for storing. As soon as the foliage starts to die, the onions must be pulled up.
Onions have a long growing period. Early sowing, i.e. March to mid-April at the latest, is therefore important. Later sowing gives a greater chance of onions with thickened stems. Row distance 25 cm, thin out to 5 to 10 cm. Placing strongly scented plants such as camomile, savory and carrots in the immediate vicinity of the onions could have a disruptive effect on the onion fly.
As soon as the foliage starts to die in September, the onions should be pulled up. The bulbs should be able to dry out well. The onions can be stored well until spring, provided they are kept cool and dry. Keep the so-called thick necks separate and eat them first.

Biologisch: Yes
Merk: The Bolster
Type en soort: Open-pollinated variety
Standplaats: Sun
Zaaien: March
Planttijd: April May
Oogst- en bloeitijd: September October
Rijafstand: 11.8 inches
Plantafstand: 10 cm
Hoogte: 50 cm
Inhoud: Approx. 1100 seeds

Dispatch

We ship your order within 1-2 business days*. When you spend €75,- you get one free shipment. Shipping is possible from €3.95. All orders are shipped as a package with a track and trace code, so you can always follow your order. Read more about the shipping costs in our FAQ.

Delivery time pre-order
Your order will be shipped from the indicated availability date. This also applies if you combine pre-order with products that are already in stock.

*Please note: In some cases this is not the case, such as: pre-orders, chicory roots, trees and small fruit. Read more in our FAQ.

The Bolster

Pioneer in organic seeds
De Bolster has been the specialist in 100% organic seeds for 45 years, with a focus on sustainability and future-proof agriculture. They produce seeds of more than 330 varieties, from vegetables and flowers to green manures, at international locations and completely GMO-free. With organic breeding methods and a commitment to variety freedom, they work together with professional growers and hobby gardeners to make organic cultivation accessible to everyone. Since 2023, they have been operating as a cooperative, to increase the impact of organic farming together with customers and suppliers. Their dream? A healthy planet with 100% organic farming.

Explanation of resistances

Our seeds are provided with different resistance codes. In this PDF you will find a clear explanation of all codes and their meaning.

Different types of seeds

What is the difference between organic, F1 hybrid, heirloom (open-pollinated), GMO, pill and conventional seeds? We explain it to you in this blog !

Saving seeds

Store seeds in a cool, dry and dark place, such as a sealed box in a cupboard. Pay attention to the expiration date on the packaging and use them before that time. If the packaging has been opened, make sure it is sealed properly and check the germination capacity before use.

You can easily test the germination capacity of seeds with a germination test :

Place a few seeds (for example 10) on a damp piece of kitchen paper.
Fold the paper towel closed and place it in a plastic bag or place it in a sealed container.
Place it in a warm place, such as on the windowsill.
After a few days, check to see if the seeds have started to germinate.

Basic sowing guide

First time sowing? No problem! Our basic sowing guide will briefly explain how to get started. Also take a look at our extensive growing guides for specific tips per plant species - super handy if you want to know exactly how to grow aubergine or garlic, for example 🌱.