Judas tree, remarkable blooming

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Purple pink flowers crowd the bare branches before a single leaf shows, and the foliage turns luminous gold in fall: the Judas tree (Cercis siliquastrum) is a 20-to-25-foot tree grown above all for that spring display. Give it deep, chalky soil and full sun, for it hates acidic ground, and it may live a hundred years.

Its purple pink flowers appear just before its leaves do, thus decorating your garden from mid-spring onwards.

Planting Judas tree

Preferably in fall or winter as long as it doesn’t freeze.

It is quite sensitive to the soil type and prefers chalky or limestone soil. It hates acidic soil. It will also grow better in rich, deep soil.

Young Judas trees are said to be quite fragile during the first few years after planting.

• Avoid spots exposed to too much strong wind.
• Favor sun.
• Water over the first year and protect roots with mulch in winter.
• Follow our advice on planting trees.

• Buy a young container-grown specimen: the Judas tree forms a deep taproot and sulks if moved once settled.
• Check the soil before digging, but focus on drainage rather than pH: Cercis siliquastrum grows in acid, neutral or alkaline ground, though it particularly favours free-draining, often chalky sites.
• Set the tree so the root flare sits at or slightly above the surrounding grade, and keep mulch pulled back several inches from the trunk so the bark stays exposed and dry.
• Because many broad-crowned trees mature with a spread approaching their height, check the species’ expected mature dimensions before planting, and site it well clear of walls, drives and overhead wires.

Pruning and caring for Judas tree

Judas tree naturally takes on a very elegant shape when it is left to grow without pruning. Still, you can slow its growth or reshape it somewhat if needed.

• It isn’t really mandatory to prune it.
• Pruning is only needed if you wish to balance the figure or reduce the size. Prune right after the blooming.
• Flowers appear on stems grown during the previous year, so if you prune in fall you’ll probably be cutting of all the flower buds.

• Prune the Judas tree (Cercis siliquastrum) sparingly and keep cuts small, since growers widely report that it resents hard pruning and that large wounds are slow to heal over.
• Cut any branch showing die-back or coral-pink pustules right back to clean wood, and take the prunings away to burn rather than compost them.
• Because many trees carry fine feeder roots in the shallow soil beneath their canopy, avoid deep digging or hoeing in that area, using mulch rather than cultivation to suppress weeds.

Growing and caring for Judas tree

The Judas tree is a very easy tree because it has the advantage of resisting the cold and freezing with a hardiness equivalent to 5°F (-15°C).

• It is doted on for its lifespan that can reach 100 years if in good growing conditions.

During the first years, feel free to provide soil conditioner to the foot of the tree to ensure its growth and blooming.

• Choose the planting spot with care, because a deep taproot makes an established Judas tree resent being moved.
• Many Mediterranean shrubs, such as lavender and rosemary, cope well with summer drought once their roots are established, but they decline or die in ground that stays waterlogged through the winter.
• On grafted specimens, rub out any shoots appearing below the graft union.

All there is to know about the Judas tree

According to the legend, this is the tree that Judas the apostle hung himself, it is found everywhere in Israel. That might be why that name stuck. But it might also simply come from the fact that it is native to Judea.

The abundant pink blooming is one of the most distinctive features of the Judas tree. It is quite easy to care for and grows relatively fast.

Native to Europe and Asia minor, you’ll find this tree appealing in spring of course with its fabulous flowering as you will in fall when it takes on luminous golden colors.

Lastly, note that it will stand out just as much whether it is planted as a standalone or paired with other trees. Planting it alone highlights its beautiful bearing, so that is worth doing if you’ve got space.

A few remarkable Judas tree cultivars

If you want the species’ toughness in a named form, seek out Cercis siliquastrum ‘Alba’, a selection of the most common variety: hardy to 5°F (-15°C), 20 to 25 feet tall and cauliflorous, with flowers emerging straight from trunk and old branches.

• Cercis canadensis bears magnificent white flowers, it is native to North America.
• Cercis siliquastrum, one of the most common varieties, is very hardy to freezing, down to 5°F (-15°C) and even 1.5°F (-17°C).
• Cercis chinensis, one of the shortest – 6 ½ feet (2 meters) only – resists the cold less and doesn’t tolerate temperatures lower than 23°F (-5°C).

This tree inspired botanists when they discovered and named another tree species, Cercidiphyllum. Indeed, katsura tree also has leaves shaped like hearts!

The botanical name “Cercidiphyllum” translates into “leaves like those of Cercis”.

Which Cercis to choose: the three species compared

The three species named above differ mainly in how much cold they take and how big they get. Match those two figures to your garden before you buy.

In a cold garden, Cercis siliquastrum is the safe choice; Cercis chinensis suits small, milder spots.

Pests, diseases and common problems

• Canker and dieback: Sunken lesions on stems, particularly in wet years, indicate fungal canker; prune out affected wood to healthy tissue and improve drainage to prevent recurrence.
• Coral spot: Tiny pink or orange pustules on dead twigs signal this fungal infection; remove all dead wood promptly and avoid wounding the bark with pruning tools.
• Scale insects: In warm, dry conditions, brown scale may cluster on twigs and branches; spray with plant oil in winter or prune out heavily infested growth.
• Poor flowering: Insufficient sunlight is the most common cause; ensure the tree receives at least six hours of direct sun daily and avoid overfertilising, which promotes foliage at the expense of blooms.
• Leaf scorch: Brown, papery leaf margins occur during prolonged drought in hot summers; water thoroughly during dry spells and mulch to conserve soil moisture.

Smart tip about Judas tree

At the beginning, mulch around the trunk to keep it cool in summer and protect it from winter frost.