Best soil recipe for raised beds in NB?

The best soil recipe for New Brunswick raised beds is 40% quality topsoil, 30% compost, 20% aged manure, and 10% coarse sand or perlite for drainage. This blend creates the well-draining, nutrient-rich environment that vegetables and flowers need in our Maritime climate.

New Brunswick's naturally acidic soils (typically pH 4.5-6.0) and clay-heavy conditions in many areas make raised beds an excellent investment. The custom soil blend bypasses our challenging native soils while providing the drainage essential during our wet springs and the organic matter needed to retain moisture during dry summer periods.

Start with quality topsoil as your base — avoid "fill dirt" or unscreened soil that may contain clay clumps or debris. Look for screened topsoil from reputable suppliers in Moncton, Fredericton, or Saint John. The compost component should be well-aged and dark — fresh compost can burn plants and tie up nitrogen. Many NB municipalities offer composted yard waste, or you can source from local farms. Aged manure (at least one year old) adds slow-release nutrients and improves soil structure. Cow, horse, or sheep manure work well, but ensure it's fully composted to avoid burning plants.

The coarse sand or perlite prevents compaction and improves drainage — this is crucial in our high-humidity climate where waterlogged soil leads to root rot. Avoid fine sand, which can create concrete-like conditions when mixed with clay particles that may be present in topsoil.

Mix thoroughly before filling beds, and aim for a final depth of 8-12 inches for vegetables, 6-8 inches for flowers. In our Zone 4-5 climate, add lime to raise pH to 6.0-7.0 for most vegetables — test first, but most NB soils need it. Apply 2-3 inches of mulch on top after planting to conserve moisture and suppress weeds.

Timing matters in New Brunswick — prepare beds in late April or early May when soil firms up but before planting season. The soil will settle 10-15% initially, so slightly overfill new beds. Plan to refresh annually by adding 1-2 inches of compost each spring, as our freeze-thaw cycles and heavy rains gradually deplete organic matter.

For large projects requiring several cubic yards of soil, hiring a landscaper ensures proper mixing ratios and delivery logistics. They can also advise on bed construction details like proper drainage and frost-resistant materials for our climate.