A member of the Rue family. Modern citrus fruits, according to genetic analysis,
are complex hybrids arising from mandarin, pummelo, citron and pepeda ancestors,
refined by more than four thousand years of cultivation.
Citrus limon, the true lemon, is widely grown commercially.
Shrub or small tree.
10-20' high and 7-15' wide.
White on top, five petals, fragrant.
In mild winter regions, possibly all year.
All lemon cultivars self-pollinate.
Years before fruiting:
3. Discard any small fruits started in the
first three years so plant can put more energy into growth.
Depends on cultivar. Oval, some cultivars
with pointed ends. Green skin turning to yellow, acidic yellow flesh.
Seedless or with seeds. Aromatic rind. Entire fruit edible
Months for fruit to ripen:
6-9. Ripe when skin is entirely yellow.
Will not ripen further after being picked, so do not pick early.
Do not allow fruit to remain on tree more than two weeks when ripe,
or fruit will become dry and tasteless.
Storage after harvest:
Lemons last about a week at room
temperature and four weeks sealed in a plastic bag in the refrigerator.
Glossy dark green, broadly lance-shaped.
Twigs may have sharp thorns.
Usually grafted onto a hardier rootstock.
Cultivars of Note:
'Eureka' blooms fall and spring and bears
year-round, has few seeds, slightly less cold-hardy and less thorny,
less resistant to insect infestation and neglect, shorter lived
'Pink Variegated Eureka' has green and
yellow striped fruit ripening to all yellow, pink flesh, blooms and
fruits nearly year-round, has few seeds, variegated leaves, less
vigorous than typical 'Eureka'.
'Lisbon' thorny, blooms in spring, bears most
of year, oblong fruit with prominent nipple, vigorous and productive,
widely grown commercially.
'Improved Meyer' is a cross between the true lemon
and either mandarin or orange, withstands a wider range of heat and cold,
has a different taste – sweeter and less acidic, thin rind has
little lemon oil flavor, making grated rind useless in recipes,
bears year-round, many seeds.
Toxic / Danger:
Not to humans. Toxic to pets.
Cultivation and Uses
USDA hardiness zones:
9b-11. Flowers and young fruit damaged
at 29°F, nearly mature fruit damaged below 28°F, defoliates
at 22-24°F, wood damage at 20°F. Needs protection from wind.
Depends on rootstock. Drought will damage crop.
Water after becoming established:
Deeply, monthly in winter to weekly in summer,
from the trunk to just beyond the canopy. Lemon trees require 20% more water than orange trees
of the same size.
Young trees need watering more often than older trees even though older trees
consume more water. A sign of insufficient water is leaves turning dull and curling inward
from the edges.
Well drained, native soil, pH 6.1-7.8
(slightly acidic to slightly alkaline), low in salt.
Apply a citrus fertilizer mid-February, May, and early October.
Follow directions on package.
Or, if using organic fertilizer, apply every month from mid-February to
early October. Do not fertilize after October to keep the plant from producing
new growth that will be harmed by early frost.
Use no more than 3" of aged compost under the
canopy and keep one foot away from trunk. Place a rodent
gnaw guard around the trunk at the bottom.
Can be grown in containers.
Not necessary. If you prune up from the bottom to expose the trunk,
you must paint the trunk with a white tree trunk paint to avoid sunscald.
Cuttings grafted onto rootstock. Seed may not
grow true or may be sterile.
Giant Swallowtail Butterfly caterpillar. This larvae resembles bird poop and has
white and black and/or brown splotches. On a large plant it will cause no harm. On a small plant,
relocate it to a large citrus or kumquat.
Citrus: Diseases and Disorders
Ornamental, edible fruit.
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