Some like it hot! Some garden veggies that is! 

Hot crops like tomatoes, peppers and eggplants need a long warm season to produce and ripen their fruit. A lot of larger tomato varieties need an average of 80+ days to start producing harvest-ready fruit. Sweet peppers (like bell peppers) are about the same but hot peppers can easily take 100+ days to reach harvest-ready maturity! Eggplants can also take 100+ days! 

Yikes! That’s not good news for us northern short-season growers!

So what’s a girl to do when she’s growing these heat loving plants in the chilly Pacific Northwest?

She gives ‘em a blanket!

Since moving to Western Washington after years of gardening in the high desert heat of Southwest Idaho, I’ve learned that some of my old tricks simply don’t work here! While we had a short growing season in Idaho, we also had hot, hot summers! Temps in the 90’s and 100’s are common throughout June, July and August. So my hot crops grew incredibly well as long as I started them indoors early enough and transplanted them out by June. 

However, gardening in Western Washington is a bit different! The Pacific Northwest has a fairly short summer season (similar to what we had in Idaho). However, the temps here stay fairly consistent and lack the heat spikes that I was accustomed to. In fact, spring and early summer (clear up through July!) can actually be a bit on the chilly side! Now, I’m a-okay with passing on those sweaty deliriously hot summer seasons! However, my peppers and tomatoes definitely took a hit last year without the heat!

This year, I’m trying something new for my heat-loving veggie friends: tomato cage hot houses!

What’s the Purpose of a Tomato Cage Hot House?

A tomato cage hot house is a quick and easy way provide an extra layer of insulation for your tomatoes, peppers and other heat loving crops! These hot houses are perfect for cooler grower zones and help warm plants during cooler spring or fall weather.  

Tomatoes and peppers ideally like daytime temps in the 70’s to 80’s (Fahrenheit) with overnight temps above 50oF (ideally in the 60’s or higher). Cooler temps can slow the growth and maturity of your plants. And, if you live in an area with a short growing season, those extended cooler temps could mean a significant reduction in harvest! 

These tomato cage hot houses help create greenhouse-like conditions that are warmer for the plants, allowing them to thrive and mimic their more natural heat-loving environment. The greenhouse plastic also helps shelter plants from cool air gusts and breezy conditions. However, there is still plenty of airflow (since the top is uncovered) to reduce the risk of fungal diseases and allow pollinators to visit blooms.

When and How to Use a Tomato Cage Hot House

These hot houses are designed to be temporary. They are most ideal to use when temps are regularly below the ideal range for your plants. In most regions, this would be during spring, possibly early summer and fall. Once summertime temps begin warming up, remove the plastic to avoid burning or drying out your plants too much.

Any crop that needs a warm, long growing season can benefit from these temporary hot houses. Peppers (especially hot peppers), tomatoes, eggplants, and okra are all great candidates for these hot houses!

These tomato cage hot houses can act as a type of season extender, allowing you to plant out sooner and harvest longer. However, they won’t protect your plants from frost since the top is uncovered. But, you can easily add an additional piece of greenhouse plastic to the top of the cages to protect your plants from overnight frost. Just be sure to remove that top piece of plastic in the morning once frost danger has passed. Otherwise, it could heat up your veggies too much and restrict too much airflow. 

My Results… So Far!

I am using these temporary hot houses on all of my tomatoes which already had tomato cages around them. Once the weather finally warms up (probably mid-July), I will remove the plastic from the cages. I also used smaller tomato cages and made little hot houses for all of my pepper plants! 

On watering days, I roll up the bottom of the plastic so that I can easily access the the plants and water them. It’s really easy to move or remove the plastic from the cages since it’s just clipped with clothespins. If we experiencing some warm days (close to 80F – although it’s rare!) I pull the plastic up a bit to allow more airflow at the base of the plants, like you see in some of these pictures. On cooler days, I pull it down so it’s resting just above the soil line. 

I added the greenhouse plastic a few weeks ago and I really do think that the growth rate on my plants has increased significantly since then (it was moving sooo slowly before!). So far, they’ve been showing faster growth than last year too! I’ve been checking them regularly for signs of fungal issues and sunburn but they all look happy and healthy! 

I can’t say exactly how much warmer the hot houses keep things, but I can certainly feel a temperature difference when I place my hand down into the cage! Since this is my first year experimenting with this method, I’ll post some updates throughout the year. But, for now, I am happy with the results I’m seeing!

How to Make a Tomato Cage Hot House

Check out the full instructions below to make your own tomato cage hot house to keep your veggies extra warm during cool spring and fall days! They are so simple and easy to make! All you need is a roll of greenhouse plastic, some tomato cages and some clothespins! 

How to Make a Tomato Cage Hot House

How to Make a Tomato Cage Hot House

Active Time: 10 minutes
Total Time: 10 minutes
Difficulty: Simple

It’s incredibly easy and affordable to make a tomato cage hot house to keep your heat-loving plants warmer during spring and fall!

Materials

  • Tomato Cage
  • 3 or 5 mil Greenhouse Plastic
  • Clothespins (3-5 per cage)

Tools

  • Scissors

Instructions

  1. Choose a tomato cage size that is appropriate for your plant and allows enough room for some growth.
  2. Place the tomato cage over your plant.
  3. Unwrap the greenhouse plastic so that it's a single layer.
  4. Hold the plastic up to the greenhouse and measure how much you will need. You want the plastic to cover about 3/4 of the cage so that it allows some airflow at the top.
  5. Cut your greenhouse plastic accordingly. Be sure to leave a little extra so that you can wrap it around and clip it.
  6. Wrap the cut piece of plastic around your cage. Overlap the loose ends and use a clothespin to secure it to the cage at the top and bottom.
  7. Use additional clothespins as needed to securely attach the plastic to the wire frame of the cage.
  8. Check your plants to ensure they are in the center of the circle and aren't resting on the plastic. If they are, you can easily reposition the cage and center it on the plant.

Notes

For watering, I unclip and pull up the bottom of the greenhouse plastic. Once I am finished watering, I pull it back down and clip it. You may also need to check and reclip the plastic occassionally to keep it taught against the cage frame, especially after windy days or storms. During warm days, you can pull the bottom of the plastic up to allow more airflow at the base of the plant. On cooler days, position it the bottom of the plastic just above the soil level.

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