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So you’ve decided to start a new garden. Before you stick that shovel in the ground, you need to know how much light the area gets. This is done by creating a sun map. Each plant has different requirements that can be found on the seed packet or plant tag.
Sometimes plant tags won’t say specific hours of sunlight, but here is a general guide:
- Full Sun: 6+ hours
- Partial Sun/Partial Shade: 3-6 hours
- Dappled Sun: 3-4 hours of inconsistent light
- Full Shade: Less than 3 hours
Most garden centers and box stores offer kits for calculating sun exposure. They cost about $18 and work easily. Just place it in the purposed garden area, turn it on and come back 24 hours later to read the results. This is one option, but there is another option…
How to Map Sun Without Tools
If you’ve got a day off, grab a lawn chair, some margarita mix, and a good book and set up right where you intend to put your garden. Have a notebook handy and when the sun starts shining on you, jot down the time. When the sun is no longer shining on you, jot down the time. From there you can calculate the hours. You may want to spend a weekend doing this so you can compare results.
Okay, I was totally kidding (well… maybe not TOTALLY, since that would work for creating a sun map). For those of us who haven’t got the luxury of lounging around in the yard for a day, you can still calculate your sun. Draw a crude map of your proposed garden as well as any tall structures around it. These tall structures include trees, buildings or anything else that may cast a dark shadow. Pick a nice day to do you sun map. Cloudy days can make it difficult to identify shady spots.
Start early in the morning when the sun is approaching the proposed garden area. Every hour draw a rough line where the sun is shining or shadows are cast with a note as to the time. Make sure you mark where the structures are casting shadows. Repeat this every hour until the sun is past the area. When you are finished, you will have something that resembles a topographical map but maps the sun on your property. It will show you when each area started getting the sun when it finished getting the sun and any breaks in between.
Based on my sun map, I know that my corners don’t get as much sun as I’d hoped. The shed and the house cast shadows. The back right corner doesn’t get the sun until 1:00 pm. The back left corner starts getting shaded around 3/4:00. When planning my vegetable garden, I may want to put some more shade tolerant vegetables in those areas. The front of the garden gets plenty of sun, so it might be ideal for my fruiting vegetables.
- Shade Garden Solutions: Eight Essential Problems Solved for Successful Shade Gardening by Gene Bush
- Garden Anywhere by Alys Fowler
- A Seed Needs Sun (a fun book for young children) by Kate Riggs
Have fun creating your sun map!
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