You can sow Mizuna direct in the soil or in module trays for later transplanting. I generally sow 5-6 seeds in each module in a module tray and plant out each little cluster of plants 3-4 weeks later. It’s a very reliable germinator.
I find the best results from a small regular sowing every 3-4 weeks from February until September. I do a larger sowing in September to last through the winter and early spring. Though larger Mizuna plants will tolerate temperatures down to -10 degrees celsius outside, I generally do my final sowing for the polytunnel (more out of habit than necessity).
Mizuna is a really versatile veg and there are a few different ways to grow it:
• Grow it as single plants that are spaced 30cm apart and will grow up to 30cm tall with leaves harvested from it over a long period of time.
• Grow it as a ‘cut and come again’ crop - where multiple plants are sown about 10cm apart with the leaves harvested when young.
At some times of the year you can harvest as early as 3 weeks after sowing, particularly when you are growing for ‘cut and come again’ small leaves.
As the name suggest with a ‘cut and come’ again crop you can cut it back with a scissors and expect a second, third or even fourth crop of delicious leaves.
You can either harvest individual leaves by hand-picking, or cut with a scissors down to about 5cm from the soil.
It’s a brassica so in theory it should be included in your brassica rotation and can be prone to all diseases that brassicas get - in practice it’s so quick-growing that you don’t get many problems with it at all. Flea Beatle can be an issue on young leaves - a fine net or fleece cover will help.
In the summer months, you need to keep it well watered to prevent it from bolting but because I sow it so regularly, I am generally not too bothered if it does bolt (just whip the plants out for composting and replace with new ones).
Mizuna will tolerate semi-shade so ideal for a shady garden.