Flexing in the wind helps trees

We get many calls from tree owners worried about trees flexing in the wind.  Conversely we get no calls regarding trees that have been planted too rigidly, so they cannot flex.

Flexing sends a message to the roots, that they are required, even to the point of where they are required (i.e. prevailing wind). Without this stimulation roots have less incentive to extend.  

This has the by product when it gets drier, there is less of a root area for the tree to garner moisture.

It is when trees do not return to vertical or if the trees are dead and have no flexibility you should call an arborist.

Being a re-assuring constant

This week, we returned to a large domestic property to plant pleached Hornbeams for a well known Garden Designer.  The resident was very pleased to see us.  We had been the specialist contractor for her previous (well known) Garden Designer.

It was nice that she remembered the name of our foreman, but incredible that this knowledge also stretched to how he like his teas!  

Autumn Leaves - What to do with them

In nature, the leaves that fall, remain either where they fall or close.  

They are then broken down by natural processes to  provide organic matter for the soil organisms, which in turn create the environment or nutrients for the Mycorrhizal fungi and roots. These  feed the tree, enabling the tree to grow a full canopy of leaves, which provide the tree with energy through photosynthesis and then fall in autumn.      

It is a closed loop recycling process. 

IF you can, this autumn leave the leaves where they fall to feed the tree. This can be speeded up by mulching the leaves, this can be down by mowing the leaves, without the  collector off, so the chopped up leaves fall to the ground  But check for hedgehogs first!

Tony Kirkam for Kew uses this process at Kew, he swears the leaves are chopped up so fine, the worms manage to take them into the ground at such a rate, there is nothing left in 24 hours!  

Try this let me know if the worms achieve this.

Grass vs Mulch around Trees

We urge you to have mulch around your trees in preference to grass or just soil. Whilst grass can have deeper roots than trees, effectively out competing them for moisture and nutrients, this is not the main reason for this.

Mulch will increase Mycorrhizal populations by up to 15 times that of grass.  This leads to a much healthier tree.

Mulching is the closest a tree will get to the floor covering of a forest. In a forest the recycling of organic matter, feeds the soil, which provides the roots and their fungi with their nutrients. On a much smaller scale your mulching will also assist.

Epicormic Growth

This growth occurs on the trunk and at the bases of branches. It is straight in nature and grows very quickly; this  is because it is diverting energy from the canopy.   This diversion of energy from the canopy is very detrimental to it and will weaken it, even leading to dieback.  

If it is never allowed to see a Sunday and is removed frequently the energy can be retained within the canopy.

When pruning, leave a collar on the cut, do not pare it back to the bark. This leaves a smaller surface area for the tree to repair.   

Trees in containers

There are some circumstances when this cannot be avoided, but please realise how alien this is to a tree.  It will require watering  more frequently, when it exhausts the soil (preferably before), it will require  feeding and top dressing. Once you have conquered these elements, you will be faced in time with the tree becoming pot bound. 

We had one lady who brought a Swedish Birch over to London when she came to live here twenty plus years ago, (in her hand luggage) when it reached a  decent size, she planted it in a plastic dustbin.  Whenever it split the dustbin,  the  dustbin was cut away, a bit of the root and soil removed and it was replanted in another plastic dustbin.  This created a large bonsai Swedish Birch in wonderful health.

For those of  you with trees already in containers,  you could lift the tree out and place it in a larger pot, but at some stage this will become a bit of a problem,  the tree could be lifted out and root pruned (like a bonsai).  We suggest however  it can be re-planted in a tree (root) friendly container.      

Call us to find out how.

BS8545:2014

 This new British Standard explains how to select trees, plant them and care for them.  The most important part as we view it is the emphasis on 5 years post planting aftercare.  If only this was to become the standard to which main clients and Local Government applied to tree planting, it would ensure that when a landscape scheme is agreed, it will come to fruition and as a high quality scheme.   Not only would this transform the local environment, but it will also contribute to a wider improvement in the general environment. 

Nearly (RHS) Chelsea Time

Got a busy week ahead setting up for the Chelsea Flower Show.  The delayed spring will allow us to use different flowering shrubs and trees. I hope the garden designers and their show gardens, have some flexibility in their plant choices (think the RHS will not allow this). Going to spot the flowers not in bloom and leaves not out.

Might have an office sweep stake on it!

Optimum Time to Plant /Transplant

The optimum time to plant or transplant is from late September, then by incremental changes, less favourable until next summer.

The earlier trees, hedge and shrubs are transplanted during this  period the longer they have in their new locations, to begin to establish prior to it becoming hot and dry. This enables them to start to create a root system to support themselves.  This reduces planting/transplanting stress, the level of aftercare required and increases the quality of transplant.

Deciduous trees/hedges/shrubs transplanted in autumn, before leaf drop, in our experience only enter autumn (leaf fall) phase early.

The benefit of planting/transplanting early in this cycle is only marginally eroded as the calender progresses.

Later in this period the planting/Transplanting process does not need to be amended until it gets into Spring and Summer. We amend the process with larger rootball if transplanting / root preparation  and always increased aftercare.  Also we cut down the time between delivery and planting of trees and shrubs.

A late spring now for a cool wet summer

As arborists we are very sensitive to how the  weather impacts on trees.

The late spring has been very benefical for trees, especially newly planted or transplanted trees.

Whilst we like nothing more that sunny weekends so that we can go out and about with our families and enjoy our gardens, but we really prefer cool, wet summers.

Trees get stressed by hot temperatures, especially when combined with dry winds and prevailing dry weather.    This can be multiplied when planted around hard surfaces / buildings (reflected heat) or when there is insufficent rooting area (unable to access moisture in the ground).

Newly planted / transplanted trees have to rely on humans to water them, whilst they establish (extend their root system to that of a normal tree). Often the will, resources and competence  are not available to these trees.

This lack of watering can have devasting results to these 'new' trees. When there are drought conditions, especially when the water table drops, even established trees can suffer.

Mulching of both newly planted/transplanted trees  can greatly assist trees, by retaining moisture within the soil, reducing competition from weeds and grass (which often have  root systems that can extend down as far as trees), slowly adding organic matter to the soil but most importantly increasing Mycorrhizal  activity by upto 15 times over grass.

Chelsea Flower Show

It should be an interesting Show this year, spring is around 5 weeks late, many of the trees and shrubs will not be doing what their designers hoped.

With the long winded design approval process, I wonder what the judges will make of it.

It will be a pleasure to meet any visitors to the show, we are in the top right hand corner of the showground (with your back to the Thames). Our stand number is MR1.

There are two exits to the showground, the Bullring to the south (Thames) and the one in the north east which takes you to Sloane Square Tube.  If you leave by this last one, you will walk past us.  If you enter from the north, turn left as you enter and we are 50 yds on the right.

The Planting 'Season'

Whilst there are some types of plants you have to plant during the  planting season (winter), such as bare root and rootballed specimens, container grown trees can be planted at any time of year.

The main drawbacks of container grown specimens are a) a (slight) premium cost to rootballed/bareroot plants, b) especially with larger trees there is less choice, c) some containers encourage girdlng roots i.e. black HDPE containers (Air Pot containers are the ones that encourage the best root systems).

It is always more favourable to plant early in the planting season, this provide plants with a longer period to establish prior to the following summer. However the advantage is incremental and planting at less optimal times, (even in Spring / Summer) can be compensated by marginal increases in aftercare.

You can therefore plant at any time of year and are not restricted to the November-March planting season.  Please remember if trying to plant just before the end of the planting season, it is not a date in the calender, it is when nature decides that a combination of longer daylight and temperature tells it that it is time for spring!