Quick Mini Greenhouses From Milk Jugs

I love using milk jugs! My kids drink a lot of milk and we always have empty gallon milk containers. These are always useful in my garden! I use them to harden off transplants and in this blog entry: to keep tender plants (like tomatoes) outside, where they’re warm and have plenty of light, while I wait for my last frost date.

We tend to freeze around Thanksgiving and start our grow season around February 24 (So, we’re already there!) That is a growing season of approximately 267 days, however we are not consistently frozen during winter. Most of our winter we keep climbing up into the 60s and 70s and frost and freezes are just peppered through that time. Also, my summers are hotter than Hades (and are super difficult to grow through). I can grow cool weather crops through the winter. I consider summer more of the down time and my winter just needs some supplemental watering.

Since I live in South Central Texas: my winters are super short. We go years without a single flake of snow (and when we do get snow it never sticks.) We aren’t always frost free, but this year none of my tropical plants have frozen back. Even my tropical hibiscus are still green.

But, seedlings are more tender, and require a little more protection. So the tomatoes I just bought at Lowe’s are now happily seated outside in their own little milk jug greenhouses, protected from chilly temperatures at night.

If you have a family who drinks milk, you can easily save your gallon jugs by nearly cutting off the bottom of the jug and nesting them inside each other. Like this:

To create a mini, milk jug greenhouse cut through the base leaving a small area attached under the handle. Carefully place your seedlings in the base. If they are too tall, then you can cut the base completely off and cover the space in between with duct tape. Either with the base attached, or without, run duct tape around the bottom of the jug and reattach the bottom to the top of the jug. You can extend the jug as tall as you need, within reason. I always keep the caps and put them on before I put the jugs outside in bright shade. This keeps any creepy crawlies from finding their way into the jug and infesting the plants.

If you have freezing nights, these can easily be picked up and brought back inside. I would be careful with the jugs. While they will definitely extend the time you can have your plants outdoors, they are not miracle workers. Depending on what you have in these, you can have some spring vegetables sprouting a couple of weeks early or have your tender summer tomatoes protected until its time to think about planting them. If you have long periods of time that are below freezing I would move them back indoors. For tender summer vegetables bring them in if it’s below 50 degrees Fahrenheit outside.

These same milk jugs are great at protecting your seedlings during hardening off. If you have cut the bases off: you can poke some holes through the lower sides of the jug for some landscape pins and push them down into the garden soil. This way you can anchor the jugs and cover your plants, after you have planted them in the garden.  If you still have the base attached, flip the bottom away from the jug and just anchor it with a big rock.

Are you thinking about buying seed, but you are tired of spending a ton of money on 25 seeds at the bottom of an otherwise empty, seed packet? I am so tired of spending 2+ dollars on a packet of seed and go out to plant them and realize there’s just a dusting of seed down in the crease of the seed packet!

If you are looking for heirloom or specialty plants and have the budget for that type of seed I would try Seed Savers Exchange, but personally: I am usually interested in CHEAP quality seed, over heirloom or specialty seed. Seed prices can decimate even a large budget, quickly.

Where else can you get this much GOOD quality eggplant seed for $1.70? Really a great company. All of their packets are like this.

I don’t want to spend $50, $80 or $100 on seed every year. I have never found a better seed purveyor than Morgan County Seeds. I’ve used them for over ten years, across the two different states (that I’ve lived in during that time.) I never get a packet from them and get heartburn over the amount of seed or the germination rates. As far as I know they are the cheapest, best source for seed. (BTW I am not financially aligned with either of these companies, I just really like them.)

Get outside and get growing! Let me know how you do with your milk jug greenhouses in the comment section! I’d love to see your garden!


17 thoughts on “Quick Mini Greenhouses From Milk Jugs

  1. I buY nut milk which almost always comes in paper, but I do buy distilled water in plastic jugs. Your idea is a great idea, and the jug can always be rinsed out and recycled later. Thanks!

  2. I go for the cheap seed to, although I purchase almost nothing. There are only a few types that I do not have access too. Regardless, I typically find that there are more seed than I need in a packet. I mean, I grow only two zucchini plants, but a packet of seed contains several seeds. Only vegetables that produce only one edible part, like beets and radishes, need many seeds. I mean, two dozen radishes won’t go very far. (I do purchase radish and beet seed because I do not collect them.)

    1. Extra seed is great for sharing. I let my mom take some seed and I’ve been on a couple of “seed trains” over the years where a group of gardeners send boxes of seeds across the country and we all share for the price of postage. I love seed trains, sometimes you can get seed that you can’t buy.

      1. My ‘seed train’ never got out of the neighborhood. It is nice to send odd things to people who do not have access to them though. That is how I got my Gladiolus papilio. Some people can not imagine why I would want what is a weed in their region, like the Eastern red cedar.

  3. I have done that too! I’ve also used milk jugs for slow watering by filling them up and putting a few small holes in the bottom. Just set them next to the plant to be watered. This year I’m going to start seeds in those plastic boxes that hold lettuce/spinach in the grocery store. They are clear and have lids.

    1. Great minds think alike! I am about to bury bottles out with my tomatoes. I use the plastic boxes for greens for my compost. They don’t have holes so I don’t have to worry about smells or flies. I use bleach water to clean the container out, between when I take it out to fill my composter (which are metal trashcans to keep the animals out of it. Texas is not a good place to have open air compost bins.)

  4. Our Master Gardener at Greenhouse Megastore uses this method and highly recommends it! Thought about trying it myself this year since I’m about to plant out some cool weather crops, but we don’t drink much milk so we usually just have cardboard cartons. When we do get a jug, it’s the opaque white plastic ones. 🙄😭😁

    1. You could try asking neighbors if they’ll save their empties for you. I made larger ones with an upside down tomato cage wrapped in bubble wrap and planted tomatoes with full water bottles next to them. Works like a “wall o’ water” but much cheaper to do. Thanks for coming by! I appreciate the visit.

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