The addition of a sunshade (Aluminet®) to the roof was installed to reduce sunlight intensity as the basis for the greenhouse (my all-time favorite plant genus-philodendron), which require reduced light intensity. Naturally, the number and type of plant varieties selected and placed into the greenhouse rapidly increased, requiring me to remove the sunshade to increase sunlight intensity (removing all philodendron species) except during the fall and winter months (image courtesy: John Green).
By: John Green, Certified Texas Expert Gardener, Orange TX
Gardeners, another wonderful week has quickly run its course, and summer is rapidly coming to an end. In fact, our local weather forecasters have assured us that next week (mid-week) will see a shift in daytime high temperatures which is our signal that fall is near at hand! The extended forecast (in my opinion is even better) as predications are that daytime temperatures decrease falling to the upper 70’s!
This gardener finds the shifting weather patterns particularly attractive since each passing day more tasks are added to an ‘ever-growing’ list of gardening chores which can’t always be managed on weekends! Last week’s discussion ended with weather stripping, sealants, insulation, hardware (brackets, hinges, screws, and nails) each an important component of a greenhouse, supporting structural integrity.
Dimensions Determining the size of the greenhouse is the second most important aspect of the greenhouse designs characteristic after identifying the optimal location. Let me reiterate a previous point mentioned which is knowing specifically what you want the greenhouse to provide you. Will the focus be on seed germination, plant propagation, cultivating vegetables, or blooming plants? Knowing and understanding objectives helps you to determine the size greenhouse required to meet your needs. Design a greenhouse to allow for added expansion since greenhouse space quickly becomes constrained. Build a greenhouse that satisfies minimal functional needs, then add additional square footage to the design (my suggestion is 25% more).
The greenhouse’s wooden benches were built outside the greenhouse then secured to the framework for added structural support. The center bench can be strategically maneuvered inside the greenhouse, or ‘rolled’ outside as needed, making plant relocation a breeze. Metal grating has been placed on top of the lawn area outside the greenhouse entryway to make center-bench movement easier when relocating plants, while allowing the lawn to remain aesthetically pleasing (image: John Green).
Interior Design (Layout)
Careful planning of the greenhouse interior is necessary to accommodate the maximum number of benches, navigate pathways, and organize plants and gardening accessories. Consider factors such as efficient space utilization (think vertical space availability), air circulation, plant maintenance and harvesting. It is important to sketch the interior layout in detail with the mindset of plant needs and workflow within the space.
Essential Requirements
The planning/ design phase is when essential requirements are incorporated into the design. Requirements must include focus on air circulation, vents, louvers, and fans with optimal placement within the greenhouse design so that each component doesn’t restrict space availability or inhibit workflow.
Irrigation is another greenhouse essential characteristic which is necessary for plants to thrive. Consider irrigation or watering system placement to make watering plants easy and not a regimented chore requiring manually carrying containers of water or dragging a garden house inside (this becomes tiring for most gardeners very quickly). Investing thought and time during the planning/ design phase of the greenhouse provides a foundation for a successful and efficient growing space. Sensible consideration of space and functionality will tailor the greenhouse to meet your exact needs!
Site Preparation
Proper site preparation will ensure the greenhouse foundation is level, has adequate drainage (critically important in SETX), and will aid in maintaining optimal growing conditions for plants. My decision was to utilize a pre-existing cement foundation located beside my home (a remnant from the previous home on the property), which dramatically reduced cost, time, and energy needed for site preparation. Follow the steps below to prepare an optimal site:
- Clear the area- remove vegetation and debris that will slow the construction process. Rocks, tree stumps, and other objects will affect the design layout, then interfere with the structure.
- Foundation leveling- ensure the area is even with a smooth surface to prevent water from pooling which can lead to uneven settling of the structure. Utilize a shovel, garden spade, or rake to diminish high spots, while filling in low areas. This is a crucial step and cannot be corrected after the fact, so expend the energy and do it right!
- Drainage- verify the site is graded to allow water to migrate away from the greenhouse. We know that our area is prone to flooding and that the soil structure is mostly clay. Clay soil when saturated holds water and drains slowly. Dig a gentle slope around the greenhouse perimeter or install a French drain to divert water away from the foundation, if needed.
- Weed prevention- a weed barrier is necessary if a foundation other than cement is selected. Lay down weed barrier fabric, followed by mulch or gravel to suppress weed growth. This will save time and energy by minimizing the need for ongoing weed management.
- Environment- make note of predominant wind direction including intensity which will help you determine the structural materials needed. Strategically position the greenhouse to maximize sunlight exposure, minimize wind impact, and optimize growing conditions. Note: nearby structures (buildings and trees) cast shade at different times of the day and it is important to understand this during preparation.
- Accessibility/ Utility connections- make certain a clear pathway is leading to the greenhouse entrance with sufficient space to manipulate and maneuver equipment such as a wheelbarrow. Enlist the help of professionals when installing electricity, water, or natural gas lines. It is always better to error on the side of caution, ensuring your safety!
A well-prepared site enables you to confidently proceed to the next stages of building your ‘dream’ greenhouse. So long for now fellow gardeners! Let’s go out and grow ourselves a greener, more sustainable world, one plant at a time! Please continue sending gardening questions to: jongreene57@gmail.com.
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