Can I put a raised bed directly on grass?

Yes! There is no need to dig up the sod. Simply place your bed frame on the grass and line the bottom with a double layer of corrugated cardboard. This will smother the grass and weeds beneath while attracting beneficial earthworms as it decomposes.

What is the best wood to use for building a raised bed?

Cedar and redwood are the gold standards because they are naturally rot-resistant without chemicals. If you are on a budget, pine is much cheaper but will only last 3-5 years. Avoid all 'pressure-treated' lumber to prevent chemicals from leaching into your soil.

How wide should a raised bed be?

4 feet is the ideal width. This allows you to reach the center of the bed from both sides without ever having to step on the soil. Stepping on the soil causes compaction, which stunts plant roots and kills microbial life.

How much soil does a standard 4x8x1ft bed hold?

A 4x8x1ft bed holds exactly 32 cubic feet of soil. If you are using 1.5 cubic foot bags, you will need 22 bags. This is often the biggest 'beginner shock' because it requires more soil than people expect. Using our calculator can prevent shopping mistakes.

Should I use a weed barrier fabric in the bottom of my bed?

Generally, no. Cardboard is better because it eventually becomes soil. Landscape fabric (plastic) can trap water, create drainage issues, and prevent deep-rooting plants from accessing the ground soil beneath the bed. Only use it on concrete or if you have severe 'burrowing pest' issues.

What is the easiest vegetable for a beginner to grow in a raised bed?

Zucchini, beans, and lettuce are incredibly forgiving. They germinate quickly and don't require the complex pruning or staking that tomatoes or peppers often demand in their first season.

How often should I water a new raised bed?

New soil is prone to drying out. In the first few weeks after planting, you should check the soil daily. Stick your finger two inches into the soil; if it feels dry, it's time to water. Once plants are established, 2-3 deep waterings per week are usually better than daily light sprinkles.

Do raised beds need drainage holes?

The bottom of a raised bed should be open to the earth or the fabric/cardboard liner should be porous. If your bed has a solid wooden or plastic bottom, you MUST drill 1-inch holes every square foot to prevent root rot.

What is the biggest beginner mistake in raised bed gardening?

Filling the bed with 100% cheap topsoil. Topsoil has no drainage and no nutrients. You MUST mix it with compost (at least 40-50%) to ensure your plants have the fuel they need to grow.

How do I calculate dimensions for an irregular shaped bed?

The easiest way is to use our tool. It allows you to input custom length, width, and depth metrics to get an instant volume. For irregular shapes, calculate the largest square and add the 'leftover' corners as separate smaller calculations.

Raised Bed Gardening for Beginners: Soil Setup & First Planting

By Altto Team• Last reviewed May 2026 • 15 min read

Congratulations on starting your gardening journey! Raised beds are the most efficient way for a beginner to grow high-quality food with minimal effort. But the most important phase happens before the first seed is ever touched. Your raised bed gardening for beginners soil setup determines your success for years to come.

Estimate Your Success Now

Use the Raised Bed Soil Calculator to see exactly how much soil you need to buy for your first project.

Open the Raised Bed Soil Calculator →

Phase 1: Location and Foundation

Sun is the primary fuel for a vegetable garden. Your bed should be placed in a spot that receives at least 6-8 hours of direct, unfiltered sunlight. If you place a bed in the shade, no amount of premium soil will help your tomatoes ripen.

The Step-by-Step Setup

Assemble on Level Ground

Use a level to ensure the bed isn't leaning. An unlevel bed will cause water to pool in one corner and leave the other corner bone-dry.

The Cardboard Trick

Line the absolute bottom with brown, non-glossy cardboard. This smothers weeds and grass without chemicals.

Fill with Multi-Source Mix

Mix your topsoil and compost in a wheelbarrow before adding it to the bed. This ensures the nutrients are evenly distributed.

Beginner Warning: The Over-Planting Trap

A 4x8 bed feels huge when it's empty, but one zucchini plant will occupy 9 square feet (3x3 area) in just 6 weeks. Always check the 'Spacing' guide on the back of your seed packet and use our raised bed tool to double-check your area math.

First Planting: The Beginner Success List

Leafy GreensLettuce and kale are very hard to kill and can be harvested multiple times.

Bush BeansBeans actually improve your soil by 'fixing' nitrogen. No trellis required.

Once you have your beds set up, you might want to look into how to fill subsequent beds cheaply or learn how to mix the elite Mel's Mix soil recipe.