Horseradish is a herb that can be very beneficial to other plants due to the oil in their roots (Isothiocyanate), that is believed to have antibacterial and antifungal properties. There are many articles online that go into more detail about Isothiocyanate, more commonly known as mustard oil.
The main benefits of choosing the right companion plants are for them to achieve higher yield at harvest time, save space in your garden and to help keep pests away. But before deciding on what plants can be grown with your horseradish, there are a couple of other things that need to be discussed first.
Horseradish is a pungent root so not everything will grow well with them, and they can spread like weeds if not contained properly. To avoid any of these two issues, you need to plant them in an isolated position and not pair them with certain plants:
Where to plant horseradish
It is better to plant horseradish in pots, containers or a raised bed, so they don’t spread all over your garden. If you want to grow them with companion plants, set up a raised garden bed and plant them together. This will ensure that you get your harvest and don’t have the additional problem of removing unwanted horseradish, for years to come.
What not to plant with horseradish
Some plants don’t like aromatic herbs and although horseradish is not the most aromatic of herbs, they still have pungent roots. Poor companion plants are things like beans and watery/leafy vegetables, such as cucumber, lettuce, and celery. Definitely avoid planting with these vegetables.
What are good companion plants for horseradish?
The biggest recommendations for horseradish companion planting is potatoes, sweet potatoes, rhubarb, asparagus, and fruit trees, like apples and pears. They are the most common companions that are guaranteed to work well together but feel free to experiment with other companions to see if they work.
It is also said that they grow well with other fruits, such as strawberries, grapes, and many other berries. But my knowledge on this is very limited, so I can’t totally agree with this. As I said before, try different things and see what does and doesn’t work.
Build a raised garden bed, fill it up with fertile soil and set up as 3 parts. On one side plant potatoes and sweet potatoes, on the other side plant rhubarb and asparagus, in the middle plant some horseradish. Be sure to allow space for the horseradish roots and leaves to grow, and don’t plant too many.
When its harvesting time for your horseradish, remove what you want to consume and replant what you want to grow for next year. But remember to remove and replace the soil first before replanting, this will ensure that you remove any unwanted roots and only grow what you need.
If you have an area that you don’t mind (potentially) being taken over by horseradish, then feel free to just plant them alongside a fruit tree or two. They will grow well with apples, pears, plums, cherries, and peaches, and if you don’t have a lot of space for a full-sized fruit tree, buy one that is grown on a dwarf rootstock.
Horseradish is easy to grow but hard to get rid of if you leave them to spread all over your garden, so you need to plant them in an isolated position. They are a beneficial companion plant for things like potatoes, asparagus, rhubarb, and fruit trees, and should not be paired up with beans and watery/leafy vegetables.
The fun part about gardening is trying things out for yourself and seeing what works and what doesn’t. Reading advice and recommendations is a good thing to do, but actually going outdoors and experimenting is a much better way to find out for yourself.