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How to Grow Geraniums (Pelargonium species)
- Plant: perennial, hardy to 20°
- Height: to 120cm
- Soil: average, well drained
- Exposure: sun, partial shade
- Propagation: cuttings, seeds
- Uses: fragrance, culinary
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Of the many different kinds of geraniums, those that are best suited
for the herb garden are the scented-leafed species and varieties. Most
of these have small flowers in clusters and interestingly textured
leaves that release a distinctive fragrance when pinched or bruised.
Rose geranium (P. graveolens) has slightly hairy, deep green, lobed
leaves, with each of the 5.7 lobes again divided and toothed. Their
fragrance is pungent, spicy, and somewhat rose-like. The leaves are used
frequently in making potpourri, jelly, and custards. Flowers appear in
clusters of 5-10 and are rose colored or purple with pink veins, but
generally they are not showy.
Lemon-scented geranium (P. crispum) has small, crinkly leaves which
can be floated in finger bowls, used in potpourris, or dried in bunches
and hung in closets to give clothes and linens a fresh, lemony scent.
The plant grows to about 70-100cm high and has small lavender flowers.
Orange geranium (Prince of Orange') has larger and broader leaves than
the lemon species. It is shrubby and has white flowers with a black spot
on the upper petals. P. crispum 'Variegatum' is peach-scented and has
small crinkled leaves mottled with yellow. The flowers are lavender.
Lime-scented geranium (P. nervosum) grows into a bushy plant with
round, somewhat ruffled, light green leaves that have toothed margins.
Their lavender flowers are abundant and showy.
Nutmeg geranium (P. fragrans) is a branching, rather bushy plant with
small, roundish, gray-green leaves. It bears small white flowers with
pink veins.
Apple-scented geranium (P. odoratissimum) has trailing stems up to
50cm long that are clothed with Peppermint geranium (P. tomentosum) has
large 8-14cm wide—attractively lobed leaves. The plants are rather
tender but will spread to 150-200cm in warm climates. Small white
flowers appear in fluffy clusters. This variety makes a good hanging
basket plant.
Almond-scented geranium 'Pretty Polly' has attractive, light green
foliage and large silvery pink flowers with dark crimson spots.
An apricot smelling variety (P. scabrum 'M. Ninon') is a large shrub
with shiny, dark green leaves and showy carmine red flowers with darker
markings.
Coconut-scented geranium (P. grossularioides) is a low growing,
trailing plant with dark green, rounded leaves. It bears clusters of
tiny, rosy red flowers.
Filbert-scented geranium ('Schottesham Pet') makes a low (30cm high)
mounding plant with deeply cut, light green foliage and red flowers.
Geraniums are tender, so in cold winter areas grow them in pots or
boxes and bring them indoors during the winter. They thrive indoors and
may even bloom if placed in a window that will provide enough sunlight.
In mild winter areas, grow them outdoors all year in permanent garden
plantings or in containers. Use the sprawling kinds as a ground cover
around trees or plant them in hanging containers.
In coastal areas plant geraniums in full sun, but where summers are
hot and dry they will do best in partial shade. Give them good, well
drained garden soil and keep it somewhat on the dry side (but don't let
them dry out completely). As a rule, geraniums planted in the garden
need little fertilizing unless your soil is sandy or very well drained.
Then, they may need 2-3 applications each year of a complete fertilizer.
Pale foliage or lack of new growth also indicate a need for fertilizer.
Pinch growing tips in the early stages to encourage side branching, and
remove flowers as they begin to fade to encourage more bloom. You can
start new plants from seeds or stem cuttings.
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