May 2023 - 35
CULTURE REPORT
planting a liner, always avoid burying the crown. This
can be fatal to a plant and geum suffer, notably when
poorly planted.
FINISH TIMES
Geum finish relatively quickly, and the Tempo series
are known to even flower as liners. Don't worry, this
won't hurt the plant in the slightest. Remember,
they're bred for an extended bloom period.
MEDIA AND FERTILIZATION
Use care when selecting a soil for geum. Geum
do especially well in an organic-based soilless media,
especially composted barks with the addition of
pumice. Avoid sodden soils. Allow plants to dry somewhat
before rewatering. Geum make excellent greenhouse
companions with heuchera, using similar soils and watering
programs. Calcium nitrate-based fertilizers seem to be best
for geum. Light-colored foliage can be an indication of high
soil pH, or high EC, so monitor fertigation, as with any other
crop. Sometimes magnesium sulfate in an aqueous solution is
the answer to quickly deepen the foliage color of geum. This
trick also works especially well on pulmonaria, too.
PINCHING AND GROWTH REGULATORS
Pinch a geum? Nope! And, these geum couldn't be better
behaved as both a container plant and a garden plant. Geum
Tempo series are the end of the floppy-sloppy geums of old.
PGRs are also not necessary. This plant holds well in
liners, 4-inch and gallon pots without getting stressed.
PESTS AND DISEASES
Geum have few pests - really! In low humidity, high heat
areas, spider mites can be a problem, but chances are one
won't have plants left to go through a high heat period. In
the garden, sometimes slugs, snails or leaf cutter bees (after
all, geum are in the rose family) might visit, but the fuzzy
leaves deter most pests.
Powdery mildew is a rarity. Botrytis usually doesn't show
up unless the plants have gone through a period of a water
stress event.
Overall, Tempo geum are among the easiest to grow new
perennials in a long time.
Chuck Pavlich is the director of new product development
at Terra Nova Nurseries. He can be reached at chuck@
terranovanurseries.com.
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May 2023
Table of Contents for the Digital Edition of May 2023
Table of Contents
Editor's Report
Industry News
Forty Under 40 Perspectives: From Beginner to Epic Gardening
Technically Speaking: Lighting Plants Indoors, Without Sunlight
Forty Under 40: Honorees of 2023
Technology: Growth Strategy by Way of Automation
Culture Report: Geum Tempo Series
Editors' Picks
Vaughn's View: Colorful & Vibrant Annual Introductions for 2024 — Part 1
Product Marketplace
Classifieds/Ad Index
Chat Room
May 2023 - 1A
May 2023 - 1B
May 2023 - 1C
May 2023 - 1D
May 2023 - 1
May 2023 - 2
May 2023 - Table of Contents
May 2023 - Editor's Report
May 2023 - 5
May 2023 - Industry News
May 2023 - 7
May 2023 - Forty Under 40 Perspectives: From Beginner to Epic Gardening
May 2023 - 9
May 2023 - Technically Speaking: Lighting Plants Indoors, Without Sunlight
May 2023 - 11
May 2023 - Forty Under 40: Honorees of 2023
May 2023 - 13
May 2023 - 14
May 2023 - 15
May 2023 - 16
May 2023 - 17
May 2023 - 18
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May 2023 - 24
May 2023 - 25
May 2023 - 26
May 2023 - 27
May 2023 - 28
May 2023 - 29
May 2023 - 30
May 2023 - 31
May 2023 - Technology: Growth Strategy by Way of Automation
May 2023 - 33
May 2023 - Culture Report: Geum Tempo Series
May 2023 - 35
May 2023 - Editors' Picks
May 2023 - 37
May 2023 - Vaughn's View: Colorful & Vibrant Annual Introductions for 2024 — Part 1
May 2023 - 39
May 2023 - 40
May 2023 - 41
May 2023 - 42
May 2023 - 43
May 2023 - Product Marketplace
May 2023 - 45
May 2023 - 46
May 2023 - 47
May 2023 - Classifieds/Ad Index
May 2023 - 49
May 2023 - Chat Room
May 2023 - 51
May 2023 - 52
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