How to Acclimate Plum Trees

Acclimate (ac·cli·mate): "To become accustomed to a new climate or to new conditions. Also to harden off a plant."

Acclimating plum trees helps minimize environmental stress when planting. Because our potted plum trees are grown in our controlled greenhouse environment, they may arrive to you already sprouting tender new growth. This growth can be sensitive to things like:

  • Temperature (below 50ºF or above 90ºF)
  • Frost snaps
  • Strong/direct sunlight
  • Wind

These conditions are more likely to occur during early spring, but can happen during other times of year in different growing zones.

NOTE: This is part 2 in a series of 11 articles. For a complete background on how to grow plum trees, we recommend starting from the beginning.

Acclimating Bare-Root Trees

Allow your tree’s roots to soak in water an hour or two before planting. Do not soak the roots for more than 24 hours.

Bare-root trees are not grown in a pot and will not have any soil around their roots – hence the name “bare root”. Our bare-root trees are shipped dormant, which helps them to transplant well and experience less transpiration (water loss) immediately after planting. The best thing you can do for a new tree is to avoid shock as much as possible, so don’t wait until it’s too late in the season to plant. The best time to plant a bare-root tree, or any other bare-root plant, is in the fall or early spring.

Acclimation Steps for Potted & Bagged Trees

If your new plants or trees from Stark Bro’s arrive in a pot and already display tender leafy growth, then they were likely grown in our greenhouses. Here are a few steps we recommend you follow to acclimate these plants and trees (or harden them off) before planting outdoors:

  • Upon arrival, unbox your plants and trees, and keep them in the pots or grow bags they arrived in. Place them in a sheltered, semi-shady spot outdoors – like on a back porch. After a day or so, move them to a sunnier spot. Water your plants upon arrival, but then allow the top of the soil to dry out – this also contributes to the hardening-off process.
  • Observe foliage – if signs of leaf injury appear prior to planting, move those plants or trees back into more filtered sunlight and an area protected from harsh winds. Air movement in outdoor conditions is equally important for hardening off the plant. Cool air helps harden the tender new growth but do bring plants back indoors at night if temperatures are expected to reach close to or below freezing.
  • After 2-3 days of acclimating your plants and trees, and if the weather conditions are right, your new plants and trees are ready to be planted outdoors in a permanent location. Your new plants and trees should be able to manage conditions, as long as soil temperatures are expected to stay above 50ºF. For best results, try to plant on a cloudy day.

Please note: these are general recommendations. Your particular growing environment might require a slight variation on these guidelines since some plants can take more time (or less time) than others to harden off. Factors like the current year’s weather, individual plants, and your location may affect the process. If conditions outdoors are too harsh, keep potted plants near a sunny window, water them, and take care of like a houseplant. Then start the process of hardening off your plants.

Latest Articles & Videos

Harvest basket full of applesHarvest basket full of apples Preparing Your Garden for a Successful Fall and Winter As summer comes to an end, it’s time to give your fruit trees and berry plants the care they need to thrive through the colder months. Proper fall maintenance not only protects your plants from winter damage but also lays the foundation for healthy growth come spring. Here’s your fall checklist to help ensure a smooth transition into the next season.
Preparing a garlic bedPreparing a garlic bed How to Prep a Garlic Bed for Planting Preparing a garlic bed properly is essential for growing healthy, productive garlic plants. Garlic is usually planted in the fall, as it needs a cold period to establish strong roots before spring growth. Here’s a step-by-step guide to help you prepare your garlic bed for planting.
citrus treescitrus trees How to Care for Citrus Trees in Containers & Successfully Grow Citrus Indoors Imagine filling your home with the vibrant scent of citrus blossoms, while enjoying fresh fruit all year long—even if you live outside the ideal growing zones for citrus! Growing citrus in containers makes this possible, allowing you to bring the beauty and flavor of citrus into any climate. With optimal care, citrus trees can bloom and bear fruit multiple times a year, adding both color, fragrance and flavor to your living space.
When are Grapes RipeWhen are Grapes Ripe When Grapes Are Ready to Harvest: A Guide to Determining Ripeness Harvesting grapes at the right time is crucial for achieving optimal flavor, sugar content, and overall quality. Grapes can be used for fresh eating, winemaking, or cooking, and each purpose may have slightly different ripeness criteria. Here’s a comprehensive guide on when grapes are ready to be harvested.

Tools & Supplies for Plum Trees