Horse Chestnut

Horse Chestnut (Aesculus hippocastanum) is a shade tree on a European scale, reaching roughly 12m tall and 8m across with a broad dome of large fingered leaves. Upright white flower spikes stand clear of the canopy in spring, and the foliage turns amber and gold before dropping for winter. It asks for a genuinely cool climate and room to be itself.

Why you'll love it

• Deep shade from a single tree. A canopy 8m across covers a lawn or a courtyard, which is the quickest way to make a hot garden usable in summer.
• Flowers you notice from the street. White candles held upright above the leaves each spring, worked heavily by bees and butterflies.
• Real autumn colour, then winter light. Leaves turn amber and gold, then drop, letting low winter sun reach the house behind.
• It copes with damp ground. Wet feet tolerant and wind tolerant, so a low corner of the block or an exposed rural boundary is workable.

Where it works best

Shade trees for large gardens. Give it 8m of clear width, 12m of height and at least 8m from the house so roots stay clear of footings and drains. This is not a small block tree, and squeezing it into a courtyard usually ends in removal inside fifteen years.

Driveways and avenues. Space trees 8m to 10m apart for a matched line. Keep trunks at least 4m back from paving, because surface roots lift edges as the tree ages.

Windbreaks and rural plantings. Sturdy branch structure suits a shelter belt or paddock boundary, particularly where the ground stays moist through summer.

Growing horse chestnut in Australia

Position and climate. Full sun, and cool temperate gardens above all: the southern highlands, the tablelands, the Adelaide Hills and cooler parts of Victoria. It needs genuine winter chill to flower and colour well, so warm coastal and subtropical gardens are the wrong home.

Soil. Deep, moist, well structured ground. It handles heavier and damp soils better than most large deciduous trees, though not compacted or permanently waterlogged clay. Dig a wide planting hole and mulch 75mm out towards the drip line.

Water and feed. Deep soak twice a week through the first three summers. It is a thirsty tree, and hot dry weather browns the leaf margins by late summer. A complete slow release fertiliser in early spring is enough.

Pruning. Very little. Remove crossing or damaged limbs in winter while the tree is bare, and lift the lower branches gradually for clearance. Avoid heavy cuts, which open the way to decay.

What to expect when it arrives

It is sold as advanced 45L stock, usually 1.5m to 2.5m tall with a single leader and the beginnings of a branch framework. Through winter it may arrive bare and dormant, which is normal for a deciduous tree rather than a fault. Expect around 30cm to 50cm of growth a year in good soil, and useful shade from about year eight.

Plants are delivered Australia wide, with delivery from $29.95. Advanced and large stock is freighted at cost. Every tree carries our 30 day healthy plant guarantee.

Plant care guides and related reading

• Choosing a canopy tree for shade
• Browse the deciduous tree range
• Trees for lining a driveway
• Plants suited to cool climate gardens

Common questions

Is it safe around pets and children?

No. Every part of the tree, including the glossy conkers, is toxic if eaten, and the seeds are the usual problem because dogs and small children pick them up. Choose a different shade tree if that is a risk you cannot manage.

Will it grow in a warm climate garden?

Not well. Without cold winters it flowers sparsely, colours poorly and scorches through summer. Cool temperate gardens are where it earns its keep, and the cooler end of warm temperate is the practical limit.

How messy is it?

Honestly, quite. Large leaves in autumn, spent flower spikes in early summer and spiky seed cases through the season. It is a poor choice above a pool or a paved entertaining area.