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How far apart you plant head lettuce depends on the variety and how big you want the heads to grow.
As a general rule, you should plant head lettuce about 10 to 12 inches apart in rows that are 12 to 18 inches apart.
If you’re growing a smaller variety, you could get away with 8 inches between plants, but if you want big, full heads, give them the full 12 inches.
The key is to give each head lettuce plant enough room so it can form a nice, tight head without competing for water and nutrients.
In this post, we’ll walk through exactly how far apart to plant head lettuce, plus the factors that change that spacing so you can get it right the first time.
Let’s dig in.
Why You Plant Head Lettuce at That Spacing
When you plant head lettuce, the spacing matters more than you might think.
Here’s why giving them room to breathe pays off.
1. Head Lettuce Needs Space to Form a Full Head
Head lettuce, unlike leaf lettuce, has to form a dense, round head at its center.
If you plant head lettuce too close together, the plants crowd each other and the heads stay small or never firm up properly.
That’s why the 10 to 12 inch spacing exists, because it gives each head lettuce plant its own little plot to fill out.
2. Airflow Keeps Disease Away
Plant head lettuce too tightly and you create a humid, stuffy microclimate between the plants.
That’s the perfect breeding ground for problems like bottom rot, mildew, and slugs.
When you plant head lettuce at the right distance, air moves freely between the heads and keeps the foliage dry.
3. Roots Compete for Water and Food
Head lettuce has a shallow root system that spreads out more than it goes down.
When you plant head lettuce close together, those roots fight over the same water and nutrients.
Giving each plant 10 to 12 inches means the roots can spread out and feed the head lettuce properly all season long.
How Far Apart to Plant Head Lettuce by Variety
Not all head lettuce is created equal, and the spacing shifts a bit depending on what you’re growing.
Here’s how to plant head lettuce based on the type you’ve got.
1. Iceberg and Crisphead Lettuce
Iceberg is the classic head lettuce, and it needs the most room.
You should plant head lettuce like iceberg about 12 inches apart, sometimes even 14 inches if your soil is rich and you want monster heads.
Rows can be 18 inches apart so you have space to walk and water.
2. Butterhead and Bibb Lettuce
Butterhead types form looser, smaller heads than iceberg.
For these, you can plant head lettuce about 10 inches apart and keep rows 12 to 15 inches apart.
If you’re tight on space, 8 inches works, but the heads will be a touch smaller.
3. Romaine and Cos Lettuce
Romaine grows upright rather than wide, so you can get away with a bit less.
Plant head lettuce like romaine about 10 inches apart in rows spaced 12 inches apart.
Just don’t go below 8 inches or the heads won’t fill out the way you want.
4. Summer Crisp and Batavian Types
These are a middle ground between head and leaf lettuce.
You can plant head lettuce of this type about 10 to 12 inches apart, same as iceberg, since they still form a substantial head.
Tips for Getting Your Head Lettuce Spacing Right
Knowing how far apart to plant head lettuce is one thing, but getting it right in the ground is another.
Here are a few tips that make it easier.
1. Thin Seedlings Early
If you direct sow, you’ll always end up with more seedlings than you need.
Once they have two or three true leaves, thin them so the remaining head lettuce plants sit 10 to 12 inches apart.
Don’t wait too long, or the roots will tangle and thinning will disturb the plants you want to keep.
2. Use a Measuring Stick or String
Eyeballing it usually leads to crowding.
Lay a measuring tape or a marked string along your row and plant head lettuce at each mark.
It sounds fussy, but it takes five minutes and saves you a season of small heads.
3. Account for Bolting and Maturity
Head lettuce that’s stressed will bolt, meaning it shoots up a flower stalk and turns bitter.
Proper spacing reduces stress, so your head lettuce stays sweet and forms a head instead of racing to seed.
4. Succession Plant for a Longer Harvest
Instead of planting all your head lettuce at once, sow a new row every two to three weeks.
That way you’re not stuck with twenty heads maturing on the same day.
Just keep the same 10 to 12 inch spacing for each new row you plant.
So, How Far Apart Do You Plant Head Lettuce?
You plant head lettuce about 10 to 12 inches apart, with rows 12 to 18 inches apart, depending on the variety.
That spacing gives each plant room to form a full head, keeps airflow moving, and stops the roots from fighting over water and nutrients.
Get the spacing right when you plant head lettuce and you’ll be rewarded with crisp, tight heads instead of sad, loose ones.
Happy planting.