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Houseplants. Ron Smith, Ph.D. Extension Horticulturist & Turfgrass Specialist. Light is Life. Measurement of Light. 1 Footcandle (fc) Amount of visible light that falls on 1 sq. ft. of surface 1 ft. away from one candle. 1 Lumen Amount of light from one candle.

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Ron Smith, Ph.D.

Extension Horticulturist & Turfgrass Specialist

measurement of light
Measurement of Light
  • 1 Footcandle (fc)
    • Amount of visible light that falls on 1 sq. ft. of surface 1 ft. away from one candle.
  • 1 Lumen
    • Amount of light from one candle.
3 major plant processes
3 Major Plant Processes
  • Photosynthesis
  • Phototropism
  • Photoperiodism
3 components of light
3 Components of Light
  • Intensity
  • Duration
  • Quality



Water Vapor





6CO2 + 6H2O C6H12O6 + 6O2


Carbon Dioxide




light quality
Light Quality
  • Blue/Violet
    • Promote foliage growth
  • Yellow/Green
    • No effect
  • Red/Far-Red
    • Encourage flowering, elongation, expansion
recommended lighting levels
Recommended Lighting-Levels

12 Hours Light Period/Day


Low50 f.c. 75-100 f.c.

Medium75-100 f.c. 200(+) f.c.

High200 f.c. 500 f.c.

Very High500 f.c. 1000 f.c.

3 types of artificial light
3 Types of Artificial Light
  • Filament-Incandescent
    • tungsten halogen
  • Excited Phosphorus
    • fluorescent
  • High-Intensity-Discharge (HID)
    • mercury, metal halide, high pressure sodium, low pressure sodium
aloe aloe vera
AloeAloe vera

caladium caladium

croton codiaeum variegatum
CrotonCodiaeum variegatum

persian violet exacum affine
Persian VioletExacum affine

rubber plant ficus elastica
Rubber PlantFicus elastica

prayer plant maranta
Prayer PlantMaranta

swedish ivy plectranthus
Swedish IvyPlectranthus

gloxinia sinningia speciosa
GloxiniaSinningia speciosa


Development of roots on a stem while still attached to the parent plant.

beneficial houseplants
Beneficial Houseplants

Spider Plant

Chlorophytum comosum

beneficial houseplants40
Beneficial Houseplants

Dumb Cane


beneficial houseplants41
Beneficial Houseplants


Dracaena fragrans

beneficial houseplants42
Beneficial Houseplants

Weeping Fig

Ficus benjamina

beneficial houseplants43
Beneficial Houseplants

Rubber Plant

Ficus elastica

beneficial houseplants44
Beneficial Houseplants

English IvyHedera helix

beneficial houseplants45
Beneficial Houseplants

Queen of HeartsHomalomena wallisii

beneficial houseplants46
Beneficial Houseplants


Schefflera arboricola

beneficial houseplants47
Beneficial Houseplants

Peace Lily

Spathiphyllum wallisii

low light houseplants
Low Light Houseplants

Cast-Iron PlantAspidistra elatior

low light houseplants49
Low Light Houseplants

Mock StrawberryDuchesnea indica


Low Light Houseplants

Sliver Net Leaf


low light houseplants51
Low Light Houseplants

Tree PhilodendronPhilodendron bipinnatifidum

low light houseplants52
Low Light Houseplants

Heart Leaf, Sweetheart Plant

Philodendron scandens

low light houseplants53
Low Light Houseplants


Schefflera arboricola

low light houseplants54
Low Light Houseplants

Baby Tears

Soleirolia soleirolii

low light houseplants55
Low Light Houseplants

Piggyback PlantTolmiea menziesii

poisonous plants
Poisonous Plants
  • Amaryllis -Hippeastrum puniceum (Barbados-Lily and other species)
  • Belladonna Lily- Amaryllis belladonna (Naked-Lady, Pink-Lady, Resurrection-Lily)
  • Boxwood– Buxus microphylla & sempervirens (Box, Boxtree and other species)
  • Buttercups– Ranunculus sp.
  • Caladium– Caladium bicolor and other species
  • Castorbean– Ricinus communis (Castor-Oil Plant, Palma Cristi)
poisonous plants57
Poisonous Plants
  • Daffodil– Narcissus pseudonarcissus (Trumpet Narcissus)
  • Dumbcanes– Dieffenbachia sp.
  • Bracken Fern– Pteridium aquilinum (Brake Fern and other species)
  • Four O’ Clock– Miracilis jalapa (Marvel-of-Peru, Beauty-of-the-Night, and other species)
  • Hollies– Ilex sp.
  • Garden Hyacinth– Hyacinthus orientalis
  • Hydrangeas– Hydrangea sp.
poisonous plants58
Poisonous Plants
  • Irises– Iris sp. (Flags, Fleur-De-Lis)
  • English Ivy– Hedera helix – and other species
  • Jerusalem-Cherry– Solanum pseudocapsicum
  • Lantanas– Lantana sp.
  • Mistletoes– Phoradendron sp.
  • Narcissus– Narcissus tazetta (Polyanthus Narcissus, Jonquil, and other species)
  • Orleander– Nerium oleander
poisonous plants59
Poisonous Plants
  • Philodendrons– Philodendron sp.
  • Poinsettia– Euphorbia pulcherrima (Common Poinsettia, Christmas Flower)
  • Japanese Privet– Ligustrum japonicum (Waxleaf Privet & other species)
  • Rhododendrons, Azaleas– Rhododendron sp.

Designed by

Jeanne & Andrea

Supervised by Ron