07/08/2026
ππ± PRODUCTION = GENETIC POTENTIAL + ENVIRONMENT
PART 6: SCENARIO 2 β OPEN FIELD + LOW TUNNEL
In our last post, we talked about open-field strawberry farming.
And we made one thing clear:
You don't need a greenhouse to become a serious strawberry farmer.
But what if you could take your open field and give your strawberries a little protection from the environment without completely enclosing them?
Enter...
π THE LOW TUNNEL
Think of it as giving your strawberries an umbrella, raincoat and little house at the same time. π
You're still farming in the field.
Your plants are still in the soil.
You're still benefiting from natural sunlight and airflow.
But now you've modified the environment.
And that is exactly what we're talking about in this series:
𧬠Genetic Potential + π± Environment = Production
π± SO WHAT IS A LOW TUNNEL?
A low tunnel is essentially a simple protective structure placed over the crop, usually supported by hoops and covered with a suitable material.
It doesn't give you the same level of environmental control as a greenhouse.
And that's actually the point.
You're not trying to completely control nature.
You're trying to manage some of its effects.
And for many strawberry farmers, that can be a very interesting middle ground.
π§οΈ THE BIGGEST ADVANTAGE?
YOU CAN KEEP RAIN OFF YOUR STRAWBERRIES.
This is huge.
Anyone who has grown strawberries during a serious rainy period knows the story.
You wake up...
You see dark clouds...
You start negotiating with God. ππ
"Please... just wait until I harvest."
Then the rain comes.
And strawberries don't particularly enjoy sitting wet.
Rain can increase leaf wetness, splash soil and pathogens onto plants, wet the fruit and create conditions favourable to diseases such as Botrytis and anthracnose.
A low tunnel can reduce direct rainfall reaching the crop and therefore reduce some of that moisture and rain-splash pressure.
Research on strawberry low tunnels has found reductions in rain-induced leaf wetness and, in some environments, lower disease incidence and higher marketable yields compared with uncovered field production.
That's a major reason to consider them.
π 1. BETTER FRUIT QUALITY
Think about the strawberry sitting under a low tunnel.
Instead of:
π§οΈ Rain β strawberry
π§οΈ Rain β flower
π§οΈ Rain β leaves
π§οΈ Rain β soil splashing onto plant
You have created a barrier.
The fruit stays drier.
And dry fruit generally means less opportunity for moisture-loving fruit diseases to take advantage of your harvest.
That can translate into:
π Cleaner fruit
π Better appearance
π Less fruit rot
π Potentially more marketable fruit
And remember...
Farmers don't get paid for strawberries that looked beautiful on the plant but never made it to the customer.
We get paid for marketable fruit.
πΈ 2. YOU'RE PROTECTING MORE THAN JUST THE FRUIT
Here's something farmers sometimes overlook.
You're not only protecting ripe strawberries.
You're also modifying the environment around:
πΈ Flowers
π Leaves
π± Crowns
π Developing fruit
Heavy rain during flowering can interfere with pollination and physically damage flowers.
A low tunnel can provide some protection during those critical stages.
And when you protect the plant's production machinery, you're potentially protecting the harvest that comes later.
π§ 3. YOU GET MORE CONTROL OVER WATER
This is another interesting advantage.
In open field:
Rain decides when your crop gets watered.
Under a low tunnel, you're able to separate rainfall from irrigation to a greater extent.
Now you can say:
"I'm going to give this plant the amount of water it needs."
rather than:
"Well... it rained for three hours, so let's see what happens." π
With drip irrigation, this can make water management much more deliberate.
But don't misunderstand this...
Less rain does NOT mean less need for water management.
The crop still needs adequate moisture.
You're simply gaining more control over where that water comes from.
π± 4. IT CAN HELP YOU MANAGE THE MICROCLIMATE
This is where we get slightly scientificβbut keep it simple.
A low tunnel changes the microclimate around the strawberry.
That means the conditions immediately around the plant can be different from the conditions outside.
You may influence:
π‘οΈ Temperature
π§ Humidity
π¨ Air movement
π§οΈ Leaf wetness
βοΈ Light conditions
And this can affect plant growth, flowering, fruit development and disease pressure.
But...
Here's the catch.
Changing the microclimate can work for you or against you.
β οΈ THE CONS β BECAUSE LOW TUNNELS ARE NOT MAGIC
Let's not sell farmers a dream.
A low tunnel can be excellent...
if managed properly.
But it can also create problems.
π‘οΈ TOO MUCH HEAT
Plastic can trap heat.
On a hot sunny day, that little tunnel can become a sauna.
And your strawberries didn't sign up for a sauna membership. π
If ventilation is poor, temperatures can rise too high and stress the plants.
That's why tunnel management matters.
π§ HUMIDITY CAN BECOME A PROBLEM
You've protected the crop from rain...
But if you trap humid air inside without adequate ventilation, you've created another problem.
Remember:
We want to reduce unnecessary moistureβnot trap humidity around the plant.
So ventilation is extremely important.
π POLLINATION NEEDS ATTENTION
Strawberries still need proper pollination.
If your tunnel design interferes with pollinator activity or you close it excessively, you need to think about how pollination will occur.
A protected environment should not become a sealed environment.
π¦ DISEASE DOESN'T DISAPPEAR
This is very important.
Some farmers hear:
"Low tunnel reduces disease."
Then they think:
"Great! No more disease."
No.
π
A low tunnel can reduce certain weather-related disease risks, but it doesn't eliminate diseases.
Poor ventilation, excessive humidity, infected planting material, poor sanitation and overcrowding can still create serious problems.
π° AND THEN THERE'S COST.
This is where the low tunnel becomes interesting.
A greenhouse can require significant capital.
Open field requires much less infrastructure.
A low tunnel sits somewhere between the two.
You are investing in:
ποΈ Hoops/supports
π§΄ Covering material
π§ Installation
π οΈ Maintenance
π¨βπΎ Labour
So the question becomes:
Does the additional protection generate enough additional marketable fruit to justify the investment?
That's the business question.
Not:
"Does it look nice?" π
π AND THIS IS WHY WE THINK LOW TUNNELS DESERVE ATTENTION
For some farmers, jumping directly from open field to a full greenhouse may be too big a financial step.
A low tunnel can potentially provide a middle ground.
You retain many advantages of field production:
π± Soil-based production
βοΈ Natural light
π¨ Natural environment
π° Lower infrastructure than a full greenhouse
While adding:
π§οΈ Rain protection
π Better fruit protection
π§ Greater water control
π¦ Potentially lower rain-splash disease pressure
π Potentially more marketable production
It's not perfect.
But farming isn't about finding a perfect system.
It's about finding a system that makes sense for YOUR farm.
π§¬π± BRING IT BACK TO OUR EQUATION
Remember:
PRODUCTION = GENETIC POTENTIAL + ENVIRONMENT
We've already discussed how the genetics of your strawberry determine its potential.
Now we're changing the environment.
Same strawberry.
Same genetic potential.
But instead of leaving it completely exposed...
We're giving it some protection.
So the question becomes:
What happens to production when we improve the environment?
That's the experiment.
And that's what makes farming fascinating.
π OPEN FIELD
Lower infrastructure cost + higher exposure to weather.
π OPEN FIELD + LOW TUNNEL
Moderate investment + some environmental protection.
π GREENHOUSE
Higher investment + greater environmental control.
None of these automatically guarantees success.
The farmer still matters.
The variety matters.
The soil matters.
The nutrition matters.
The irrigation matters.
The management matters.
And the market matters.
π SO... WOULD YOU CONSIDER A LOW TUNNEL?
If you were starting strawberries today and had limited capital, would you choose:
π± OPEN FIELD
π OPEN FIELD + LOW TUNNEL
π‘ GREENHOUSE
And here's the real question...
Would you rather spend more money controlling the environmentβor start smaller and invest the money into mastering the crop first?
Let's hear from the farmers. ππ
The Strawberry Farm Kenya
Growing strawberries. Testing ideas. Sharing what we learn. ππ±