Upload
others
View
1
Download
0
Embed Size (px)
Citation preview
Leisure and Cultural Services Department
Planting Herbs in School Scheme
2017/18
PeppermintMentha ×××× piperita
Sweet MarjoramOriganum majorana
Lemon Balm Melissa officinalis
Peppermint
Scientific Name: Mentha × piperita
Common Name: Peppermint
Family: Lamiaceae (Labiatae)
Genus: Mentha
Place of Origin: Unknown
Distribution: Widely cultivated all over the world,
including Europe, North Africa and the
United States.
Mentha × piperita
Characteristics
• A perennial herb
• Peppermint stops growing in
winter.
• It is tolerant of low temperatures
and is suitable for year-round planting in Hong
Kong.
Mentha × piperita
Growth Habits and Care
Mentha × piperita
• Peppermint thrives in a sunny
environment, preferably with sunlight
that is not too intense.
• It should be placed in a cool, shady
and well-ventilated spot on sizzling summer days.
• It grows best in well-drained soil with organic matter.
• Adequate soil moisture is essential for its proper
growth.
• Water moderately and avoid waterlogging to prevent
infestation and infection.
Propagation
Mentha × piperita
• By division
• By rhizome cuttings
Prevention and Treatment of
Pests and Diseases • The stem of Peppermint is susceptible to rust in an
environment with low temperatures, excessive moisture
and poor ventilation.
• Watch out for attacks from aphids, snails, slugs and fungi.
• The plant should be pruned in a timely manner to ensure
good ventilation.
• Keep the environment clean and well-ventilated.
• If pests or diseases are found, remove the infected parts
and apply appropriate insecticide or fungicide
immediately.
Mentha × piperita
Horticultural Application and
Economic Value Peppermint has wide applications:
• Horticulture – most suitable for
cultivation in
gardens or on rooftops
• Medicinal use
• Culinary use – cooking (as an ingredient)
and tea-making
• External use – production of essential
oils
Mentha × piperita
Points to Note
• Given the invasive nature of its underground
rhizomes, Peppermint is often planted in pots to
prevent the plant from growing rampant like
weeds.
• After the growth of the plant becomes stable, gradual pruning can
be performed to improve ventilation.
• Harvesting should generally be done in the morning before
Peppermint blooms.
• Additional fertiliser, especially nitrogen, should be applied as
appropriate after harvest.
• The plant is not suitable for use or consumption by pregnant
women.
Mentha × piperita
Sweet Marjoram
Scientific Name: Origanum majorana
Common Names: Sweet Marjoram,
Marjoram, Knotted Marjoram
Family: Lamiaceae (Labiatae)
Genus: Origanum
Place of Origin: The Mediterranean coast
Distribution: Europe, Turkey and
North Africa
Origanum majorana
Characteristics
• A perennial herb
• Usually grown as an annual in
cold regions
• Suitable for planting all year
round in Hong Kong
Origanum majorana
Growth Habits and Care
• Sweet Marjoram thrives in a dry and
warm environment with full sunlight.
• It grows best in well-drained and slightly chalky
loams with rich organic matter.
• A wet and cold climate is not conducive to the
growth of this frost-intolerant plant.
• It is drought-tolerant.
• If the soil in the pot is soggy or waterlogged, the
plant will grow poorly and the roots may even rot.
Origanum majorana
Propagation
• Mainly by cutting
Origanum majorana
Prevention and Treatment of
Pests and Diseases• Sweet Marjoram rarely suffers from
pests and diseases.
• If it is grown in soil that is over-watered
or too wet, the roots may rot, causing
the plant to wilt.
• Infestation and infection can be
prevented by keeping the environment
clean and well-ventilated.
Origanum majorana
Horticultural Application and
Economic Value Sweet Marjoram has wide applications:
• Horticulture – most suitable for
cultivation in gardens or
on rooftops
• Medicinal use
• Culinary use – cooking (as an ingredient
or sauce)
• External use – production of essential
oils and beauty
enhancement
Origanum majorana
Points to Note
• Sweet Marjoram should be brought indoors
during cold snaps in winter.
• Keep it in a well-ventilated and properly shaded place to
prevent the leaves from being burnt in the scorching heat of
summer.
• Harvest the stems by snipping them at 10 to 15 cm from the
ground before flowering.
• Additional fertiliser, especially nitrogen, should be applied as
appropriate after harvest.
• The plant is not suitable for use or consumption by pregnant
women.
Origanum majorana
Lemon Balm
Scientific Name: Melissa officinalis
Common Name: Lemon Balm
Family: Lamiaceae (Labiatae)
Genus: Melissa
Place of Origin: Uncertain
Distribution: Once widely grown in the eastern
Mediterranean region; now grown
throughout southern Europe, Asia and
other parts of the world.
Melissa officinalis
Characteristics
• A perennial herb
• While Lemon Balm is tolerant
of low temperatures, it stops
growing in winter.
• It is suitable for planting all
year round in Hong Kong.
Melissa officinalis
Growth Habits and Care
• Lemon Balm thrives in areas with full sunlight.
• The plant prefers partial shade in hot summer.
• It grows best in well-drained loam containing
organic matter.
• Adequate soil moisture is essential for its proper
growth.
Melissa officinalis
Propagation
• Lemon Balm can be propagated
by seed sowing, cutting or
division.
• To sow, simply sprinkle the tiny,
light-loving seeds over the
surface of the soil.
Melissa officinalis
Prevention and Treatment of
Pests and Diseases• Lemon Balm has no serious pest
or disease problems.
• It is susceptible to diseases if light
penetration or ventilation is poor.
• Pay attention to ventilation and prune as necessary.
• If pests or diseases are found, remove the infected
parts and apply appropriate insecticide or fungicide
immediately.
Melissa officinalis
Horticultural Application and
Economic Value Lemon Balm has wide applications:
• Horticulture – most suitable for
cultivation in gardens or
on rooftops
• Medicinal use
• Culinary use – cooking (as an ingredient)
and tea-making
• External use – production of essential
oils and beauty
enhancement
Melissa officinalis
Points to Note
• Frequent pruning can improve ventilation and,
more importantly, encourage development of
new buds bearing leaves with a stronger fragrance.
• The herb grows fast and should be planted in pots to avoid
affecting other plants.
• Harvest the leaves before flowering.
• Apply additional fertiliser, especially nitrogen, as appropriate
after harvest.
• The plant should not be used or consumed by pregnant
women.
Melissa officinalis
Information leaflets on the herbs and the relevant
presentation materials will be uploaded to the
following web page in due course:
• http://www.lcsd.gov.hk/en/green/education/
greeningschool/plant.html
PeppermintMentha ×××× piperita
Sweet MarjoramOriganum majorana
Lemon Balm Melissa officinalis