Transplant Shock - Helping Your Tree Recover

When a tree is uprooted from the ground at a nursery, potted up, transported and replanted in your backyard, it will undergo a period of stress called transplant shock. Trees communicate this stress through a range of physical cues, which may become severe in certain cases. Thankfully, there are some easy steps you can take before and after planting that will help reduce the transplant shock in your newly planted tree!

 

A tree’s journey from the nursery to your backyard can be a stressful one. During this time, root damage and changing environmental conditions are the two main sources of stress - or shock - for a tree. Some root damage is inevitable when a tree’s roots are cut down to fit into a container for transportation. As a result, newly planted trees must depend on a smaller root system to supply their water and nutrients than what they are used to. The stress created by this supply and demand imbalance can be heightened by possible incompatible conditions that await a tree in its new home, such as infertile soil, limited space and changes in climate.

Wilting leaves after planting may be one sign of transplant shock

 

After planting, a tree can communicate transplant shock in a number of ways including wilting or falling leaves, premature fall colour, dying branches and, in serious cases, death. Transplant shock can also make a newly planted tree more susceptible to pests and diseases.

It is important to understand that transplant shock is normal to a degree. However, you can take steps before and after planting to minimize its impact and help your tree recover and establish quicker.

Newly planted tree have reduced root systems which creates stress
 

Before planting

  1. Find the right tree for the right place - Tree species have unique soil, sunlight and spacing needs, so when you plant a tree that matches your property’s conditions, you can reduce stress in the short and long term. A certified arborist can help assess your property and recommend a suitable tree species.
  2. Pick a native tree - Native trees have evolved to local climate conditions and soils, which give them a distinct advantage in adapting and recovering after transplant.
  3. Plant your tree at the right time of year - Spring and fall are the best seasons for planting your tree because the weather is cooler and more water is available underground. Hot and dry summer weather may intensify stress to a newly planted tree.
 
Watering helps protect your tree against moisture stress
 

After planting

  1. Water regularly - Water is a critical tool in the fight against transplant shock as newly planted trees may struggle to meet their water needs with fewer roots. Water trees twice weekly using approximately six gallons of water each time. This is the equivalent of using 3 full watering cans twice per week, or using a hose with no nozzle on a very slow trickle for approximately 15 minutes, twice per week.
  2. Apply mulch - Natural mulch, such as woodchips, helps retain soil moisture, protects damaged roots against extreme temperatures and improves soil quality as it decomposes over time. Spread mulch two to four inches thick in a “doughnut” shape around the base of your tree.
  3. Don’t prune right away - During the first few years after planting, a tree is focused on growing and establishing its root system underground. Pruning your tree during this time can add stress, so only prune dead, diseased or broken branches.
 
Are you curious about which tree is right for your backyard? Apply to our subsidized Backyard Tree Planting Program today and receive a consultation with a certified arborist to help you find the right native species for your yard.

 

Jess Wilkin is the Residential Planting Programs Operations Coordinator. She holds a Master’s of Forest Conservation from the University of Toronto.

 

LEAF offers a subsidized Backyard Tree Planting Program for private property. The program is supported by the City of Toronto, the Regional Municipality of York, the City of Markham, the Town of Newmarket, the Town of Ajax, the Regional Municipality of Durham, the Township of Scugog, the City of Pickering, the City of Oshawa, the Town of Whitby and Ontario Power Generation.

 

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