Soil Guide: What Soil Does Your Plant Need?

Getting the soil right is one of the most important steps to giving your new plant the best possible start. Below we've grouped our plants by their preferred soil type so you can prepare your planting spot with confidence.

Free-Draining, Sandy or Loamy Soil

These plants dislike waterlogged roots and thrive in open, well-draining conditions. Improve heavy clay soils by mixing in horticultural grit or sharp sand before planting.

Mimosa / Persian Silk Tree (Albizia julibrissin) – prefers light, well-drained soil; tolerates poor soils once established.
Judas Tree (Cercis siliquastrum) – well-drained loam or sandy soil; dislikes sitting in wet ground.
Coral Tree (Erythrina crista-galli) – free-draining soil essential; very sensitive to waterlogging.
Jacaranda (Jacaranda mimosifolia) – sandy, well-drained soil; avoid heavy clay.
Crape Myrtle (Lagerstroemia) – adaptable but performs best in well-drained loam.
Brugmansia / Angel's Trumpet – rich, moist but well-drained soil.
Crimson Bottlebrush (Callistemon citrinus) – well-drained, slightly acidic to neutral soil.
Foxglove Tree (Paulownia) – deep, fertile, well-drained soil.

Fertile, Moisture-Retentive Loam

These plants appreciate a richer, more moisture-retentive soil. Incorporate well-rotted compost or leaf mould at planting time to improve structure and fertility.

Indian Bean Tree (Catalpa bignonioides) – deep, fertile loam; benefits from shelter and good moisture retention.
Golden Rain Tree / Pride of India (Koelreuteria paniculata) – fertile, well-drained loam.
Laburnum (Laburnum anagyroides) – any fertile, well-drained soil.
Lilac Tree – fertile, humus-rich, well-drained soil; prefers neutral to slightly alkaline pH.
Silver Birch – adaptable; prefers light, well-drained but moisture-retentive soil.
Mountain Ash / Rowan (Sorbus aucuparia) – fertile, well-drained soil; tolerates most conditions.
Chinese Mahogany (Toona sinensis) – deep, fertile, moisture-retentive loam.
Eastern Redbud (Cercis canadensis) – fertile, well-drained loam.
Himalayan Honeysuckle (Leycesteria formosa) – moist, fertile, well-drained soil.
Persian Lilac (Melia azedarach) – fertile, well-drained soil; drought-tolerant once established.

Conifers: Well-Drained, Slightly Acidic Soil

Most conifers prefer a slightly acidic to neutral pH (5.5–7.0) and good drainage. Avoid waterlogged or heavily compacted ground. A mulch of bark chippings helps retain moisture and suppress weeds.

Monkey Puzzle Tree (Araucaria araucana) – well-drained, slightly acidic loam.
Blue Spruce – moist but well-drained, slightly acidic soil.
Italian Cypress (Cupressus sempervirens) – well-drained, alkaline to neutral soil; very drought-tolerant.
Bhutan Cypress – moist, well-drained soil; tolerates a range of pH.
Himalayan Cypress – well-drained, fertile soil.
Darjeeling Weeping Cypress – moist, well-drained, slightly acidic soil.
Chinese Weeping Cypress – well-drained, slightly acidic to neutral soil.
Thuja Orientalis / Chinese Arborvitae – well-drained, fertile soil; tolerates chalk.
Scotch Pine (Pinus sylvestris) – poor, sandy, acidic soil; excellent on dry sites.
Yunnan Pine (Pinus yunnanensis) – well-drained, slightly acidic soil.
Bhutan Pine (Pinus wallichiana) – deep, well-drained, slightly acidic loam.
Italian Stone Pine (Pinus pinea) – sandy, well-drained, neutral to slightly acidic soil.
Mexican Weeping Pine (Pinus patula) – well-drained, slightly acidic soil.
Monterey Pine – well-drained, slightly acidic to neutral soil.

Acacias & Wattles: Poor to Moderate, Well-Drained Soil

Acacias are nitrogen-fixing plants that actually prefer poorer soils. Avoid over-enriching with compost or fertiliser, which can cause excessive leafy growth at the expense of flowers.

Silver Wattle (Acacia dealbata) – light, well-drained, slightly acidic soil; tolerates poor ground.
Queensland Silver Wattle (Acacia podalyriifolia) – well-drained, sandy or loamy soil.
Cootamundra Wattle (Acacia baileyana purpurea) – well-drained, slightly acidic, poor to moderate soil.
Cape Wattle (Albizzia lophantha) – well-drained, sandy or loamy soil; tolerates poor conditions.
False Acacia (Robinia pseudoacacia) – well-drained, poor to moderate soil; very adaptable.

General Planting Tips

Check your pH: A simple soil pH test kit (available at most garden centres) will tell you whether your soil is acidic, neutral, or alkaline — this makes a big difference for many of our plants.
Improve drainage: On heavy clay, dig in horticultural grit and raise the planting area slightly to prevent waterlogging.
Mulch after planting: A 5–8 cm layer of bark mulch around (but not touching) the stem helps retain moisture, regulate temperature, and suppress weeds.
Avoid over-fertilising: Young trees and shrubs generally need little feeding in their first year — let them establish their root systems first.

If you have any questions about soil preparation for a specific plant, feel free to get in touch with us.