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What Size Cedar Planter Box Do I Need? A Guide for Calgary Gardeners

Evergreen LTD owner Aaron Cull poses with a custom made cedar planter box
Evergreen LTD owner Aaron Cull poses with a custom made cedar planter box

Whether you're growing herbs on a sunny balcony or planting tomatoes in your backyard, choosing the right cedar planter box size is key to a thriving garden. In Calgary, where growing seasons are short and space can be limited, optimizing planter dimensions helps ensure strong plant growth, better moisture retention, and efficient use of your yard or patio.


Here’s how to determine the best cedar planter box size for your needs—plus expert tips to make your garden low-maintenance and long-lasting.


Best Planter Box Sizes by Plant Type

Herbs (Basil, Thyme, Parsley, etc.)

Herbs are compact and adaptable, but they still need enough room for roots to grow and soil to retain moisture.

  • Indoor use: 6" depth minimum

  • Outdoor use: 12" depth preferred

  • Width: 12–14" allows for multiple herb varieties

  • Ideal for: Windowsills, balconies, small patios



Leafy Greens (Lettuce, Spinach, Arugula, Swiss Chard)

Shallow-rooted but fast-growing, leafy greens need room to spread for higher yields.

  • Minimum depth: 6"

  • Larger greens (e.g., chard): 12" depth

  • Width: At least 18" for multiple rows

  • Ideal for: Small to medium patios, elevated beds


Thinking about starting a salad garden this spring? Talk to Evergreen LTD—we can help you size and install the right raised bed.


Tomatoes (Especially Indeterminate Varieties)

Tomatoes demand significant space to thrive, especially the indeterminate types that keep growing and fruiting all season.

  • Minimum size: 18" depth and width

  • Ideal size: 24" diameter, 20+ gallon soil volume

  • Essential for: Root development, stability, and airflow

  • Ideal for: Large patios, garden plots, sunny yards


Tired of small containers limiting your tomato harvest? Evergreen LTD builds deep, durable cedar planters perfect for heavy feeders like tomatoes.


Matching Planter Box Size to Your Space

Small Spaces (Balconies, Condo Decks)Planter Size: 30"L x 16"W x 15"HPerfect for: Herbs, greens, compact peppers

Medium Spaces (Townhome Patios, Small Yards)Planter Size: 40"L x 20"W x 15"HGood for: A mix of greens, herbs, root veggies

Large Spaces (Backyards, Community Gardens)Planter Size: 48"L x 24"W x 18.5"HBest for: Tomatoes, squash, multiple plant groupings


Not sure what fits your space? Let Evergreen LTD measure and custom build your ideal planter boxes for any area.


Key Features for Long-Lasting, Productive Planters

1. Drainage

Good drainage prevents root rot.

  • Drill 3–4 holes (1/4") in the base

  • Elevate the box slightly for runoff


2. Material

Cedar is naturally rot-resistant and insect-repelling.

  • Long lifespan

  • Minimal maintenance

  • Safe for edible plants


3. Accessibility

Raised beds (24”+ tall) reduce bending and strain.

  • Great for seniors or gardeners with mobility issues

  • Makes maintenance quicker and easier


4. Aesthetic Appeal

Cedar’s natural tones and clean lines work well in modern and rustic yards alike.

  • Blends with stone, concrete, or wood exteriors

  • Easily customized with stains or finishes


Whether you want a rustic look or a sleek urban style, Evergreen LTD builds cedar planters to match your design vision.


Why Choose Cedar Planter Boxes in Calgary?

  • Weather-resistant: Handles Calgary’s dry winters and sudden weather shifts

  • Local appeal: Natural look complements native and ornamental plantings

  • Sustainable: Cedar is a renewable resource and chemical-free for food-safe gardening


Ready to Grow? Evergreen LTD Can Help.

Choosing the right size cedar planter box means healthier plants, easier maintenance, and better use of your outdoor space. Whether you’re building a balcony herb garden or prepping for tomato season, a well-sized, high-quality planter makes all the difference.

Evergreen LTD offers:

  • Custom-built cedar planter boxes

  • On-site consultations for sizing and layout

  • Durable, weather-resistant materials

  • Installation and long-term care tips


Contact Evergreen LTD today to design your perfect Calgary garden setup. From patio planters to raised beds, we make gardening easier, smarter, and better looking.

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