Make your own backyard greenhouse

This is the first year that I have ordered seeds and am trying to grow as much as I can with my own starts.

Don’t get me wrong, starts are amazing, and you can plant right after your last freeze.

The problem is that I have admittedly been very intimidated by seeds. It might sound silly but I was really worried the seeds would fail, and that would be the be all end all of my joy of gardening.

But I had to look back and see that gardening with starts isn’t always a guarantee of success either.

Between things not well suited for my growing zone, pests, disease and FROST I have thrown an awful lot of starts into the compost pile and headed for the nursery before.

The idea of something so tiny that does not resemble the finished product in away way fascinates me.

With good soil, light and moisture that seed turns into a teeny baby plant, grows, and more often than not ends up on your dinner table.

So with a lot of reading and many learning moments on You Tube I decided it was my year.

I ordered heat mats, some organic seed starting mix, some containers and grow lights and started my search for what I wanted to grow this year.

Celery, tomatoes, herbs, cucumbers, cabbage and all lettuce grow well in my area. As do carrots, melons, cilantro and peppers. This year I added to the mix flowers, and some heirloom seeds peas, beets, chives, and a chocolate pear tomato I am excited to see!

I made a list of the seeds that need to start inside that I will transfer to my greenhouse in the earlier months, and a list of direct sow seeds and when everything needs to get planted.

This is helping a lot as I felt a little overwhelmed as the little packets arrived and I did not have a plan.

That is a pattern for me 🙂

So as the little baby plants are growing under lights and the slower to germinate seeds are breaking thru the dirt, I realized I am in need of a transitional place for them. In addition to an safe place to grow and harvest from until our last frost. This is anywhere between April 1st and May 1st.

We decided we wanted the greenhouse somewhat close to the back of our house where it can get good light and be easily accessible.

From other projects we have done, we have quite a bit of scrap wood we have saved. So the only thing I bought was the roll of clear plastic. We had the wood, a drill, staples and staple gun, and a few latches and handles in our odds and ends bin.

Folks, this is where I started to get really excited, as the walls came up on the greenhouse more little lettuce starts were coming up under the grow lights.

Here is what we used:

We used a lean-to model and cut the top and bottom plates with 2×4 wood each six feet long for the top and bottom in the back. We attached these to the edge of our deck and the privacy fence behind. We used 4 2×4’s at 92 inches for the back wall, spacing them evenly. For the front we knew we needed doors so we used two 2 foot pieces in the front and a six foot piece on the top. We then ran four 80 inch pieces for for the front corners and each side of the door. We used 6 40 inch side pieces to connect the front to the back wall. We used 2×2’s running 5 evenly spaced each 42 inches long for the roof at a slope for rain to properly run off the top. Luckily we had some extra 2×6 wood which we used to create a shelf on the right side, and another shelf along the back attaching to the middle 2×4 framing.

The doors we used 2×2 wood for framing and cross members. One door is 36″ and the other 12″. Once the frame and roof were complete we stapled 4 mil plastic along the outside of the exterior walls, around the doors and the back. We did the roof last to overhang past the wall plastic to protect from rain.

Once that was done we moved our tiered planter back in and added the handle and latches. It was amazing how quickly we noticed a difference in the temperature as well as the moisture that built up in the greenhouse right away.

For a bit of added detail we used some leftover cedar fencing to trim the outside edges to make the greenhouse look finished and also strengthen the plastic.

I have moved some more starts (lettuce and spinach) into the greenhouse now to make room on the heat mats and under the grow lights for new seeds.

I have to admit that after feeding our cat, dogs and bunny the place you will find me every morning is in this little greenhouse. It is my little zen spot, I am loving it!

Thank you so much for reading friend! I hope you have an amazing week, until next time!

xo, Tanya

27 Responses

  1. Tanya, your gardening journey sounds like a wild ride! I can totally relate to being intimidated by seeds. I once tried to grow sunflowers from seed and was convinced they’d never sprout. But lo and behold, they did! Your list of veggies and flowers sounds amazing. I’m curious, how are you planning to keep pests at bay in your greenhouse? And what’s the most challenging part of starting seeds indoors that you’ve encountered so far? Can’t wait to hear about your garden’s progress! 🌱

  2. Your backyard greenhouse build sounds practical and inspiring — especially the scrap-wood and plastic film approach. Excited to try some of your layout and planting tips for this spring!

  3. After reading this text, I recognised myself — I was also afraid to start with seeds for a long time, because it seemed that one failure would destroy all my enthusiasm. In fact, what the author writes about the constant risks even with seedlings really resonates with me. Gardening is always an experiment, and you shouldn’t expect perfect results. I like the honesty and simplicity of the presentation. By the way, while looking for other information, I came across an article about sports medicine — https://ways2well.com/blog/regenokine-vs-stem-cell-which-treatment-works-best-in-sports-medicine — and was surprised that it also explains complex things in an accessible way. Both approaches motivate you not to be afraid to try.

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  9. I loved reading about your greenhouse build—especially how you repurposed scrap wood to save costs while still creating a functional space for transitioning seedlings. That lean-to design against the deck is a clever way to maximize warmth and accessibility. As someone who also enjoys mixing hands-on projects with a bit of whimsy, I’ve found that taking a break from garden planning to explore something completely different, like AI palm reading for fun, adds a nice balance. It’s a lighthearted way to pass a rainy afternoon while waiting for those seeds to sprout. Thanks for sharing your detailed blueprint!

  10. This is such a practical guide for building a greenhouse with scrap materials, I love the lean-to design and the step-by-step framing details. As someone who also struggles with seed starting, I’ve found that monitoring soil temperature and humidity closely makes a huge difference. For anyone looking to take the guesswork out of greenhouse management, there are now accessible tools that use machine learning to predict microclimate changes and optimize plant growth. I recently came across AI for science tools that compile the latest research and applications in this area, which could help gardeners fine-tune their setups using real data rather than intuition alone. Thanks for sharing your build process!

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  12. This is a fantastic DIY greenhouse build—I love how you used reclaimed wood and kept costs low. For anyone documenting plant growth cycles or experimenting with seed germination data, having a clean way to visualize results is a huge help. I recently started using a research diagram tool that lets me create scientific-style illustrations of my garden layouts and even generate data charts from my seed-starting logs without coding. It exports to SVG for easy editing, which saved me hours of manual drawing. Your step-by-step frame construction reminded me how useful such a tool is for planning raised beds or greenhouse shelving too. Great project!

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  14. This is such an inspiring gardening journey! I love how you turned your initial hesitation about starting from seeds into an exciting learning experience. The idea of building a backyard greenhouse is perfect for giving those tiny seedlings a safe place to transition and grow before moving them outdoors. Your seed list sounds amazing too, especially the heirloom peas, beets, flowers, and chocolate pear tomato. It’s wonderful to see how a little planning, patience, and experimentation can make growing from seed feel much less intimidating. I’m looking forward to seeing how your greenhouse and garden turn out this season!

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hi there !!

Welcome to twelveOeight! I’m Tanya and I am so glad you are here. If you are ready to start loving the home you have now, then join me on my mission. One thrifty project at a time we can make our today homes our dream homes.

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