Citrus x Pyriformis


Famous for bearing astonishingly giant citrus, Citrus x pyriformis—commonly known as the Ponderosa Lemon Tree—is a spectacular indoor and patio orchard favorite. A natural hybrid of the pomelo and citron, this thick-stemmed evergreen tree features large, glossy leaves paired with lush clusters of highly fragrant, purple-tinged white blossoms. What makes it truly legendary is its fruit: it yields massive, bumpy-skinned lemons that can each weigh up to two to four pounds! Containing true, tangy lemon juice with a hint of floral sweetness, these impressive fruits dangle dramatically from sturdy branches, serving as an extraordinary conversation piece and a rewarding home harvest for sunny windowsills, patios, or sunrooms.

  • Toxic to pets and children
  • Repot once every 2 years
  • Fertilize once a month
  • Average water
  • Bright, direct light

About Citrus x Pyriformis

Origin

A hybrid discovery originating in Maryland in the late 19th century, believed to be a natural cross between a citron (Citrus medica) and a pomelo (Citrus maxima). It is widely grown as an ornamental indoor citrus due to its manageable size and massive fruits.

Air Purifying

Releases refreshing citrus oils into the air while filtering ambient indoor gases and releasing fresh oxygen. Its broad evergreen leaves help improve room humidity when kept near sunny windows.

Toxicity

Toxic to cats and dogs due to essential oils and psoralens found throughout its foliage, stems, and fruit peel. Ingestion can cause stomach upset, vomiting, diarrhea, and photosensitivity.

Caring for Citrus x Pyriformis

Watering

Water thoroughly once the top 2 inches of soil feel dry to the touch, ensuring complete drainage out of the pot. Never allow the roots to sit in stagnant water, which rapidly causes root rot and leaf drop.

Light and Placement

Requires 8 to 12 hours of bright, direct sunlight daily to successfully produce flowers and heavy fruit. Position in a sun-drenched south-facing window, or support with a high-output grow light during winter.

Nutrition

Feed monthly from spring through summer using a specialized citrus fertilizer packed with nitrogen and key micronutrients like iron and zinc. Reduce fertilizing in fall and winter when active growth slows down.

Repotting

Repot every 2 years in spring using a fast-draining potting blend mixed with coarse sand, perlite, and bark. Choose a broad, heavy container to anchor the tree and balance the weight of its massive lemons.

Pruning and Flowering

Prune leggy branches in early spring to maintain a sturdy frame that can support large fruit clusters. Bears sweet-smelling white flowers year-round that yield lemons weighing up to two pounds each.

Citrus x Pyriformis SOS

Illness

Susceptible to scale, spider mites, and mealybugs, especially in dry winter air indoors. Yellowing leaves generally indicate poor soil drainage, nitrogen deficiency, or exposure to cold drafts below 50°F (10°C).

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