Care Guide | Citrus

Citrus trees are among the most rewarding fruit plants you can grow. From sweet mandarins and kumquats to exotic finger limes bursting with "citrus caviar," these evergreen trees provide beautiful foliage, fragrant blossoms, and abundant fruit for decades. Many citrus varieties begin producing within just a few years and can yield hundreds of fruits annually when properly cared for. Whether you're growing a cold-hardy Sugar Belle, a gourmet Finger Lime, or a compact Callie Kumquat, citrus trees offer year-round beauty and delicious harvests.

Characteristics

Citrus trees are evergreen subtropical fruit trees that thrive in USDA Zones 8-11, depending on the variety. They prefer full sun, well-drained soil, and consistent moisture. Most citrus varieties grow 8-20 feet tall, though dwarf trees and container specimens can be maintained much smaller.

Unlike many fruit trees, citrus often bloom and fruit simultaneously, creating a stunning display of fragrant white flowers alongside ripening fruit. Trees are generally long-lived, with many producing for 30 years or more.

Plant multiple citrus varieties to extend your harvest season and improve pollination.

Recommended Varieties

If you're anxious about that awful citrus greening that's wiped out entire groves across Florida, set your fears aside; we've selected the most superior and most HLB-tolerant citrus varieties so you don't have to do any guess work and can just focus on producing delicious fruit. This combination provides excellent disease resilience, strong cold tolerance, extended harvest seasons, outstanding fruit quality, and exceptional ornamental appeal for Florida landscapes.


 SUGAR BELLE® MANDARIN GIANT GREEN FINGER LIME RED FINGER LIME CALLIE KUMQUAT
Species Type Mandarin hybrid (LB8-9) Australian Finger Lime Australian Finger Lime Kumquat
HLB-resistance (Citrus Greening resistance) One of the most HLB-resistant orange trees  Not generally susceptible to greening Not generally susceptible to greening Among the more HLB-tolerant traditional citrus relatives, though not to the level documented for Sugar Belle
Cold Tolerance Among the hardiest mandarin reported to withstand about 18°F (-8°C) Usually damaged below the mid-20s°F, (less hardy than kumquats and Sugar Belle) Usually damaged below the mid-20s°F, (less hardy than kumquats and Sugar Belle) Among the most cold-hardy citrus, often surviving into the upper teens (°F) when mature
Fruit Flavor Perfect blend of sweet and tart  Intense lime flavor; highly acidic Intense lime flavor with berry-like and floral notes Sweet peel with tart flesh
Fruit Texture Traditional mandarin segments Distinctive "citrus caviar" vesicles Pink-red "citrus caviar" vesicles. Small, segmented fruit
Fruit Color Deep orange Green exterior and green pearls Red to burgundy skin with pink-red pearls Orange
Seeds Can be seedy Usually few Usually few Usually few to none
Harvest Season November to December Often late summer through winter Often late summer through winter Late fall through winter
Tree Vigor Vigorous Moderate Moderate Moderate to vigorous
Thorns Minimal Heavy thorns Heavy thorns Moderate thorns
Ornamental Value Attractive but prized for its fruit Very ornamental with unusual foliage and fruit. Very ornamental due to its red fruit Very ornamental, compact grower
Container Suitability Fair to good Excellent Excellent Excellent
Commercial Potential High, especially for regions that need HLB resistance Specialty gourmet market Premium chef and cocktail market Niche fresh market and ornamental

Overview

  • 🏷️ Scientific Name: Citrus spp.
  • 📊 Classification: Evergreen fruit tree
  • 📍 Origin: Varies
  • 🗺️ USDA Hardiness Zones: 8-11
  • 📏 Height Potential: 6-20 feet
  • 🏡 Planting: Landscape or container
  • ☀️ Light: Full sun
  • 💧 Soil/Watering: Well-drained soil, moderate moisture
  • 🍴 Fertilizer: Citrus-specific fertilizer
  • ✂️ Pruning: Light annual pruning
  • ❄️ Cold Weather Care: depends on the variety
  • 🍊 Fruiting and Harvesting: Typically 2-5 years after planting
  • 🕷️ Common Pests: Citrus leafminer, aphids, scale, spider mites
  • 🐈 Toxic to Pets? Mildly toxic if large amounts of foliage are consumed

Scientific Name

Citrus trees belong to the Rutaceae family and primarily fall under the Citrus genus. Common cultivated species include Citrus reticulata (mandarins), Citrus limon (lemons), Citrus sinensis (sweet oranges), and Microcitrus australasica (Australian Finger Limes).

Most modern citrus varieties are hybrids developed through centuries of cultivation and breeding.

Classification

Citrus are evergreen fruit trees and shrubs that retain their leaves year-round. They produce fragrant flowers followed by colorful fruits rich in vitamin C, antioxidants, and essential oils.

Most citrus trees are self-fertile, meaning a single tree can produce fruit without requiring a pollinator. However, multiple varieties often increase fruit production.

USDA Hardiness Zones

Most citrus thrives in USDA Zones 9-11, though some varieties can survive colder conditions.

Most Cold Hardy: Callie Kumquat, Satsuma Mandarin, and Sugar Belle.

Less Cold Hardy: Finger limes, lemons, and limes

Mature Sugar Belle trees may tolerate temperatures near 18°F, while Callie Kumquats can survive brief exposure to the upper teens. Finger limes generally require protection below 25°F.

In Central Florida, occasional freezes may damage tender growth but rarely kill established cold-hardy varieties.

Height Potential

Tree size varies significantly by variety and rootstock. Dwarf Trees generally grow 4-8 feet, which makes them ideal for containers or the landscape. Standard Trees that grow 10-20 feet are best for landscape planting.

Planting

Plant citrus in a location receiving at least 6-8 hours of direct sunlight daily. Choose well-drained soil and avoid low spots where water accumulates after heavy rain. Space dwarf varieties 6-8 feet apart and standard varieties 12-20 feet apart.

Planting Steps

  1. Dig a hole twice as wide as the root ball.
  2. Plant slightly higher than surrounding soil grade.
  3. Backfill with native soil.
  4. Water thoroughly.
  5. Apply 2-4 inches of mulch while keeping it away from the trunk.

Light

Citrus trees require full sun for maximum fruit production. 6-8+ hours is best. Insufficient sunlight results in reduced flowering, lower fruit production, weak growth, and increased disease susceptibility. Container-grown trees can be moved seasonally to maximize sun exposure.

Soil & Watering

Citrus trees prefer slightly acidic soil (pH 6.0-6.5) with excellent drainage and consistent moisture. For young trees, water 2-3 times deeply per week. Once established, watering every 7-14 days may be sufficient. Water more frequently during times of drought, though. Avoid overwatering. Citrus roots require oxygen and may decline in soggy soil.

    Fertilizer

    Citrus are moderate to heavy feeders.

    Use a fertilizer specifically formulated for citrus that includes Nitrogen, Magnesium, Iron, Manganese, and Zinc. Yellow leaves often indicate micronutrient deficiencies rather than lack of nitrogen.

    Pruning

    Citrus requires relatively little pruning. Prune lightly to remove dead branches, crossing limbs, rootstock suckers, and damaged growth; however, avoid excessive pruning since fruit develops on mature wood.

    Finger limes may require occasional thinning because of their dense, thorny growth.

    Cold Weather Care

      Protect trees whenever temperatures are forecast below their tolerance range. Use frost cloths, water deeply before freezes, and if grown in a container, you can relocate during temperature extremes. Young citrus trees are much more vulnerable than mature trees. Finger limes benefit greatly from frost protection during their first several winters. Learn more in our Overwintering Guide.

      Fruiting & Harvesting

      Most grafted citrus trees begin fruiting within 2-5 years. Unlike many fruits, citrus does not continue ripening after harvest. How to know your fruit is ready to harvest: 

      • Sugar Belle: Deep orange color and slight softness
      • Finger Limes: Full size fruit that easily detaches and has developed color  
      • Callie Kumquat: Fully orange skin with a slightly soft texture

      Citrus Greening (HLB) Tolerance

      Citrus greening remains the most serious disease affecting citrus production. However, you are in luck, because we have chosen the best and most HLB-resistant cultivars. They are all pretty similarly resistant, but in order, here is their tolerance:

      Most Tolerant Varieties

      🥇 Sugar Belle

      🥈 Finger Limes

      🥉 Kumquats

      Healthy nutrition programs, irrigation management, and pest monitoring significantly improve tree performance under HLB pressure.

      Common Pests

      • Citrus Leafminer: Creates winding trails in young leaves
      • Aphids: Feed on new growth and excrete honeydew
      • Scale Insects: Appear as bumps on stems and leaves
      • Spider Mites: Cause stippling and leaf bronzing
      • Asian Citrus Psyllid: Primary vector of citrus greening disease

      If one of these insects decides to make a home out of your plant, use neem oil—a safe and organic oil that helps combat pests—and touch each insect with it; this will help remove it and will kill the bug as well. If you don't have any neem oil on hand, you can even use a little vegetable oil mixed with water. 

      Toxic to Pets?

      Citrus trees are considered mildly toxic to dogs and cats if large amounts of leaves, stems, or peel are consumed. Essential oils and compounds found in the foliage may cause digestive upset. Fruit flesh is generally not dangerous in small amounts, but pets should not be encouraged to eat citrus regularly.

      After Arrival Care

      Please give your plant a little TLC after its journey through the mail 📬. Here are a few steps we recommend:

      • Unwrap immediately to provide fresh air to the plant and soil.
      • Wait a few days before exposing to full sunlight so your plant can adjust after being in a dark box for several days.
      • Always protect from heat and cold because temperature extremes can be stressful or deadly for plants.
      • Water. Your baby plant may be parched and even a little wilted but thorough hydration will help it recover.
      • Grow out in either in a larger pot or directly in the ground.

      Learn more in our After Arrival Care Guide. 

      Shop Citrus

      Start or continue growing your Citrus collection with Wellspring Gardens,

      Happy planting! 🪴