Corn salad (Valerianella locusta) is one of those plants that have almost too many names.
Where I live, the plant is referred to as “Winter salad” or “Mache’”. But a quick search reveals names like common corn salad, lamb’s lettuce, feldsalat, nut lettuce, and field salad.
Quick facts: Growing corn salad is about timing. Start seeds in the spring and fall. Seeds will germinate when seed temperature reaches 10 degrees Celsius (50 degrees Fahrenheit). Plant the seeds where they will grow. Water, draw a line in the soil with your finger, plant seeds about 1 cm (0.4 inches) deep, and cover with soil. Water regularly as roots are shallow and dry outs will stress the plant to bolt.
And not too surprisingly, corn salad is a true cold weather – and even a winter – plant.
If you have ever tried to sow and grow corn salad during the height of summer, you’ll know what I mean.
With its shallow roots, the plant may suffer from drying out and could have occasional attacks from mildew.
The fact remains that corn salad is a favorite leafy green in our household. This article will tell you all you need to know about this wonderfully hardy and tasty little plant.
As a bonus, I will round off the article with my favorite way of growing corn salad.
- Growing corn salad from seeds outdoors
- When to sow the corn salad seeds
- Leaving the corn salad to flower and self-seed
- Growing corn salad indoors year-round
- Cultivate corn salad seedlings indoors
- How to harvest corn salad
- My favorite Hack to grow corn salad outdoors
- Frequently asked questions
Growing corn salad from seeds outdoors
Corn salad is a very easy plant to grow if you stay away from the hot summer months.
You can sow corn salad seeds in your vegetable garden from January onwards depending on your climate. Just make sure that the ground is frost-free when you plant your seeds.
Seeds will start to germinate when the soil temperature reaches 10 degrees Celsius (50 degrees Fahrenheit). If the weather turns freezing cold, cover your garden bed.
Corn salad likes compost-rich soil that can hold moisture while offering good drainage.
Water the ground before you plant the seeds. Do not plant the seeds too deep. From my experience, planting the seeds shallowly and then covering them with a thin layer of soil works best.
I draw a line in the soil with my finger. I try to keep the depth to around 1 cm (0.4 inches).
I then water.
When the soil has absorbed the water, I plant the seeds in situ (where they will grow). I am always generous and plant 3-5 seeds every 10 centimeters.
When I plant in drills (or rows), I allow ca 30 cm (12 inches) between the rows for growing space.
Tip: Do not plant the seeds too deep or the seeds will rot. It is better to plant too shallow than too deep.
Water regularly, as corn salad doesn’t like to go dry. When the first leaves appear, make sure you water the soil, not the leaves. If you water the leaves, you risk attracting mildew and pests.
When to sow the corn salad seeds
I sow in two main batches when I plant seeds outdoors:
Batch 1: January – April
I sow in smaller batches one week or so apart during January – April for harvest continuous harvest.
Batch 2: August-September
I also sow weekly batches in situ in August-September for harvest in November. This second batch will grow slower, and the seeds will need longer to germinate.
But be patient. This is normal.
Also, some August-September batches are not necessarily harvested the same year but are left over winter. It does, however, depend on the temperature, as when the first leaves sprout you need to harvest before the first frost.
But planting corn salad late in the year will allow me to harvest lovely green leaves in early spring the following year.
I simply cover the plants during the coldest periods, but you will be surprised how frost and winter-hardy the corn salad is.
Leaving the corn salad to flower and self-seed
The plants left unharvested will bloom around May-June if left alone.
These blooming plants will, in turn, self-seed and give you many more corn salad plants by early September.
Choose to harvest these plants from October or leave them to overwinter to have plants to harvest next spring.
And if you leave some of these plants to bloom, you will always have fresh greens to harvest.
I do recommend harvesting full plants and planting new seeds now and then. It is always good to introduce fresh plants to your vegetable garden.
Fun fact: This is also why some people believe that this annual plant is a perennial. This is however not the case. The plant is simply a prolific and successful self-seeder.
Growing corn salad indoors year-round
It is quite easy to grow corn salad indoors year-round and harvest tender leaves as they develop.
To grow the seed indoors, simply scatter seeds in a container and cover them with soil.
The plant likes compost-rich soil. Make sure to use a pot that will hold moisture while giving good drainage.
Remember to water regularly, as corn salad does not like to dry out.
The seeds will take longer to germinate during the darker months of the year.
I do recommend using a grow light during the winter months.
Cultivate corn salad seedlings indoors
If you want to kick-start your growing season, you can plant seeds indoors to develop seedlings.
These seedlings can then be transplanted into your vegetable garden when the ground temperature exceeds 10 degrees Celsius (50 degrees Fahrenheit).
Short on indoor growing space? Hydroponics is a great way to grow fresh herbs and vegetables in small spaces.
Make sure that you keep the root clumps intact. Ideally, you transplant the entire contents of the pot.
If the seedlings grow too dense, you have a happy problem. Simply thin out the plants by harvesting the leaves for eating as the plants settle and grow.
How to harvest corn salad
Corn salad is harvested leaf by leaf, or you can cut the whole plant. The leaves you harvest are eaten or used as lettuce or spinach.
My favorite Hack to grow corn salad outdoors
Like many other gardeners, I have to plan how I use available space for planting and growing herbs and vegetables.
This holds true for both indoors and outdoors.
When it comes to growing corn salad (and leafy greens in general), I have a system that works really well for me.
Step 1: Buy a sack of soil from your local garden shop
Choose good quality compost-rich soil with good drainage.
Step 2: Prepare the sack of soil for planting
Preparing the sack is as easy as 1, 2, 3, and 4.
First, we cut three strips to expose the soil.
Then, we push a sharp stick or instrument all the way through the sack to create holes for drainage.
Next, we water the sack of soil until the soil is moist but not soaking wet.
Finally, we use our fingers to make lines about 1 cm (0.4 inches) deep along the exposed strips of soil.
Step 3: Plant the seeds
Now, we plant the seeds. I am quite generous and usually scatter the seeds along the strip.
If my seedlings grow too thick, I will happily thin out the leaves by harvesting baby greens early.
When planted, I simply cover the seeds with the excess soil.
Again, do not plant the seeds too deep.
When the seeds are covered, we gently water the soil until it is moist.
Step 4: Keep soil moist and remember that the sacks are mobile
Now we wait until the seeds germinate, and we can see the first leaves or cotyledons.
I water regularly and make sure that the soil never dries out.
I move the sack into part shade on hot days to avoid midday dryouts.
After all, if you are mobile, you should use it.
And there you have it.
I usually have at least a few sacks of salad greens on the go.
It is an excellent way to make better use of space during the growing seasons without claiming it as a permanent vegetable garden.
After all, everyone loves a busy vegetable garden when it is green and growing.
And corn salad makes for a nice variation from lettuce and other leafy greens that are more often grown in vegetable gardens.
Frequently asked questions
How long does it take to grow corn salad?
It will take corn salad approximately 35-70 days to mature. The plant is often planted in spring and in the fall. When you plant in the fall, seeds will take longer to germinate, and the plant will also develop slower.
Can you grow corn salad anywhere?
Corn salad is resilient to cold and frost and can be grown in most climates. But you must protect the plants if temperatures drop as low as -15 degrees Celsius (5 degrees Fahrenheit).
How do you grow a salad all year round?
The simple answer is to grow corn salad.
You can, of course, grow regular salad year-round in heated greenhouses. This is, however, seldom economical.
Growing corn salad will allow you to harvest tasty green leaves year-round with just some planning and effort.
Does corn salad need full sun to grow?
Corn salad will grow faster if exposed to full sun.
But the plant will tolerate part shade – it may even protect the plant from dryouts during the hottest months.
Why does corn salad dry out so easily?
Corn salad has a shallow root system. Shallow roots mean that the plants quickly absorb moisture from rainfall and manual watering.
The plant can not absorb water from deeper soil.
The good news is that the shallow roots will make the plant bounce back quickly if you just water.