How to Grow and Care for Eureka Lemon Trees

Eureka lemon trees are cold-sensitive, nearly thornless trees that produce abundant lemons year-round with a spreading, open-growth habit. The foliage on an established tree turns from a bronze shade to a bright green, and the white blooms are fragrant, pretty, and have a purple-tinged bud.

These citrus trees are relatively short-lived and have a moderate growth rate, reaching maturity at about 10 to 20 feet tall. You can plan them throughout the year. Outside its range, the tree can be grown in a container, sunning outside during summer and moved indoors before frosty weather.

Note that Eureka lemon trees can be toxic to pets.

How to Plant Eureka Lemon Trees

When to Plant

Eureka lemon trees prefer to be planted in the spring after the threat of frost is over. It is best to avoid planting during temperature extremes, such as cold or hot weather.

Selecting a Planting Site

Lemon trees are susceptible to cold weather conditions. The trees need a warm and sheltered position to thrive.

Because they like a lot of water, it isn't recommended to plant your Eureka lemon tree directly into a flat lawn where the grass could get oversaturated. Build up a wide mound to plant the tree on top of or select a sloped position for proper drainage.

Spacing, Depth, and Support

Prepare a hole as deep as the root ball and about twice as wide as the root ball. Plant the trees at least six to eight feet apart.

Eureka Lemon Tree Care

Light

Plant or place Eureka lemon trees in a full sun location that gets at least six direct hours of sunlight per day. Although they can cope in a partially shaded location, they won't produce an abundant harvest, and their growth rate will slow significantly.

Soil

You'll need well-drained soil for your Eureka lemon tree, preferably loamy or sandy. They thrive in acidic conditions.

Water

Eureka lemon trees are more water-hungry than the 'Lisbon' variety. Ensuring the soil is kept consistently moist is recommended. In the summer, you may need to water the tree every day.

Don't be tempted to mulch around the tree, as this can result in waterlogging. Although these trees like to be kept moist, they can't stand saturated conditions or standing water.

Temperature and Humidity

Well-suited to Mediterranean-style climates, Eureka lemon trees aren't a cold-tolerant species. If temperatures reach as low as 20°F, your tree will likely not survive outside. They also don't cope well with harsh winds and need a sheltered location.

They prefer temperatures around 75°F or above for year-round fruiting, although increased cold-hardiness does develop as they mature. When temperatures drop, container-grown trees should be moved indoors to a warm and sunny spot until warmer temperatures return.

If your house is very hot and suffers from dry air, using a humidifier can help to ensure the tree receives enough moisture and remains healthy and fruiting.

Fertilizer

Heavily fruiting trees use a lot of energy and are always hungry. They appreciate adding organic matter to their soil and having a bi-annual feed with a fertilizer specifically designed for citrus trees.

Pollination

Lemon trees are self-pollinating. One blossom contains both male and female parts to allow self-pollination. To help pollinate, you can sacrifice one blossom and rub its interior on the interior of other blossoms, transferring pollen to the right areas in the flower.

Eureka Lemon Trees vs. Lisbon Lemon Trees

Eureka lemons don't have such a prominent mammilla (protruding nipple) as Lisbon lemons, and their skin is more textured. The fruit develops along the outside edges of the branches.

Additionally, Eureka lemon trees don't have the thorns you find on the Lisbon type, but they aren't quite as cold-tolerant and need to be moved indoors if there's even the slightest sign of frost.

Eureka lemon trees have a spreading growth habit and an open form, while Lisbon lemon trees are more upright, and their fruit grows inside the tree's dense canopy.

Harvesting Eureka Lemons

Harvest only mature fruit, which is indicated by their size and color. They should be at least two inches in size and glossy, fully yellow in color. They can also be picked when green or greenish yellow.

If you must pick green fruit due to cold temperatures or vacation, keep the fruit at room temperature to cure, allowing the fruit to become yellow slowly. Pick ripe lemons by hand by giving the fruit a slight twist, so it releases from the branch.

The pulp of Eureka lemons is greenish-yellow, high in juice content, and very acidic. Each fruit usually has nine seeds or fewer.

How to Grow Eureka Lemon Trees in Pots

Eureka lemon trees can be grown in pots, especially if you're able to move the pot outside in summer. It's a great option if you live in a cool climate or have the right environment for a citrus tree but only have limited space.

• Choose a large container of any material at least 18 inches in diameter with multiple drainage holes.
• Fill with well-draining potting soil. Container plants dry out faster than in the ground, and the same holds for potted lemon trees.
• Water whenever the top few inches of the soil become dry, as often as needed. Do not let the soil dry out completely. You can use a moisture meter to help guide your decision.
• Move the lemon tree outdoors once temperatures at night are consistently above 40°F, and move it back inside once the temperatures dip again.
• Note that potted lemon trees will have more stress because of their confined root systems, making them more vulnerable to cold weather.
  

Pruning

Because of their open-spreading habit, Eureka lemon trees don't need pruning regularly but trim away diseased, damaged, or overcrowded sections. This can be done at any time of the year.

Over the years, Eureka lemon trees can reach up to 20 feet in height. If you want to keep them more compact, prune them more often.

Propagating Eureka Lemon Trees

You can propagate root cuttings if you want a clone of your parent Eureka lemon tree. Unlike other citrus varieties, lemon trees can easily propagate from semi-hardwood cuttings. The key is to select healthy, new growth during the late spring or early summer without any flowers or fruit.

Here's how to propagate a lemon tree:

1. Take a 6-inch cutting with a sterile, sharp cutting tool, making your cut at a 45-degree angle.
2. Use a sharp cutting tool to remove all the leaves except the top three.
3. Dip the bottom 2 inches of the cutting in rooting hormone.
4. Fill a pot about 8 inches with equal amounts of perlite and peat moss, then water thoroughly and evenly before inserting the cutting.
5. Make a 2-inch deep hole in the soil with your finger or a pencil and insert the cutting.
6. Cover the cutting loosely with a plastic bag to prevent humidity.
7. Put the pot in a hot, sunny area that reaches about 75°F to 90°F and keep the soil moist.
8. The cutting will begin to root in about two to three months.
   

Common Pests & Plant Diseases

All lemon trees are tasty to various plant and garden pests and are afflicted by many diseases. Pests include whiteflies, rust mites, mealybugs, and aphids. While established adult trees usually can withstand an infestation or two, smaller, more vulnerable trees can be decimated by any of these issues.

To control and eliminate pest issues, begin by pruning away any dead, unhealthy, or infected tree areas. Treat the plant with horticultural oil, likeneem oil, diluted significantly, reapplying frequently until all signs of infection have ceased.

The most common diseases include citrus canker bacterial disease and many fungal diseases, including anthracnose, sooty mold, root rot, and botrytis rot (gray mold), all of which can be treated accordingly with fungicides.

From: thespruce