I'm finally turning a sunny patch of my backyard into a vegetable garden this year. I've been sketching out a raised bed garden design, but I'm stuck on the practical details. How deep do the beds really need to be for things like tomatoes and carrots, and is there a downside to making them too wide to reach the middle?
Tomatoes do best in a deeper bed so shoot for 12 to 18 inches of soil. Carrots need at least 12 inches for good roots. If you can go 18 inches for both you gain flexibility. Don’t forget drainage and a light loose soil mix so roots can grow.
A practical width is three feet so you can reach the middle from either side. Four feet works if you have long arms or a central path for access. If you go wider plan for a cross path so you do not have to reach through soil.
Focus on the soil mix as well as depth. Use a light fluffy blend with compost and good loam so the bed drains well and wont compact. It pays to pre blend the soil so roots can grow freely.
Plan to water efficiently with drip irrigation or soaker hoses to keep soil moist without constant fuss. Good irrigation helps tomatoes and carrots perform better in raised beds.
Mise en place can apply to garden planning too. Lay out the bed depth and width first and make a quick list of soil and amendments you need before you start building.
If you want I can sketch a simple two bed plan based on your space and climate zone and give you a shopping list and timeline.