The soil beneath the tree is the home of the tree's roots. This area is very important. Good deep soil means that the tree roots can grow far down and anchor the tree very well. It is through the roots that the tree gets its water supply. Root hairs all over the roots absorb moisture from the soil and this then rises right up the tree as far as the leaves and the extra is transpired into the air from the surface of the leaves. So, trees are great for draining soils that might otherwise be too wet.

The soil underneath the tree is covered with leaves that fall from the trees in autumn. As these are broken down, their nutrients enter the soil which means that there is a whole variety of tiny creatures living there such as mites, platyhelminths and lots of micro-organisms. These are too small to see but the fertility of the soil depends on them, and they in turn depend on the tree's roots and dead leaves.


In early spring, before the leaves come on the tree there is plenty of light available under the tree. Flowers need light to grow, so this is why so many woodland flowers are spring flowers. Wildflowers such as celandine, primrose, wild garlic, anemones and bluebells all grow under trees and flower from early March till the canopy closes. Gardeners, knowing this, have developed lovely early flowers from bulbs which can grow well under trees. Some like crocuses, grape hyacinths and snowdrops also provide very welcome supplies of pollen and nectar for early bumble bee queens who each need to visit up to 6,000 flowers to gather enough food to set up nests for the year. These are much better flowers to plant rather than daffodils or tulips which have very little pollen or nectar for bees.


In summer lovely ferns can grow under trees. The tree bark itself is where lush mosses grow. A lichen-covered bark tells us that the air all around is really clean as many lichens cannot grow if the air is polluted. Neither lichens nor mosses harm a tree in any way.


In Autumn many of the fungal micro-organisms that are working away under the tree, breaking down and recycling nutrients, come into their reproductive phase and send up fruiting bodies – mushrooms and toadstools. Puff balls, ceps, chanterelles are found growing under trees as well as a huge variety of ones that are not edible for humans although other wildlife can eat them.


This is the time when the tree gets to take a well-earned rest. It prepares to protect itself from any cold and freezing weather that may come. Deciduous trees drop their leaves. They won't be making food in the winter so they don't need leaves to photosynthesise. To do this, they produce a chemical, abscisic acid, that causes the leaves to fall off. This chemical also stops growth so the tree can conserve energy in times of little sunlight. Evergreen trees however do things differently and can produce their own natural antifreeze to see them through the winter.

What do you see under your favourite tree?

www.treeday.ie  Copyright © 2021. Tree Council of Ireland
Website Design by Dave Curran Design / execution development by Media Villa Webdesign Ltd.