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Houseplants - PowerPoint PPT Presentation

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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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Houseplants l.jpg


Ron Smith, Ph.D.

Extension Horticulturist & Turfgrass Specialist

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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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Footcandle1 Lumen of light per sq. ft. of area


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3 Major Plant Processes

  • Photosynthesis

  • Phototropism

  • Photoperiodism

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3 Components of Light

  • Intensity

  • Duration

  • Quality

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Water Vapor




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6CO2 + 6H2O C6H12O6 + 6O2


Carbon Dioxide




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Light Quality

  • Blue/Violet

    • Promote foliage growth

  • Yellow/Green

    • No effect

  • Red/Far-Red

    • Encourage flowering, elongation, expansion

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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.

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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

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AloeAloe vera

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Norfolk PineAraucaria heterophylla

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Umbrella TreeBrassaia

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CrotonCodiaeum variegatum

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Corn PlantDracaena fragrans 'massangeana'

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Persian VioletExacum affine

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Rubber PlantFicus elastica

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HydrangeaHydrangea macrophylla

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Prayer PlantMaranta

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Paper-white NarcissusNarcissus tazetta

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Boston FernsNephrolepis exaltata 'Bostoniensis'

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Swedish IvyPlectranthus

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Mother-in-Law TongueSansevieria

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GloxiniaSinningia speciosa

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Wandering JewTradescantia or Zebrina

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Dumb CaneSunburn

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ScheffleraGhost Ring Virus

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Variegated Spider PlantFluoride Tip Burn

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

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Beneficial Houseplants

Spider Plant

Chlorophytum comosum

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Beneficial Houseplants

Dumb Cane


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Beneficial Houseplants


Dracaena fragrans

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Beneficial Houseplants

Weeping Fig

Ficus benjamina

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Beneficial Houseplants

Rubber Plant

Ficus elastica

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Beneficial Houseplants

English IvyHedera helix

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Beneficial Houseplants

Queen of HeartsHomalomena wallisii

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Beneficial Houseplants


Schefflera arboricola

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Beneficial Houseplants

Peace Lily

Spathiphyllum wallisii

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Low Light Houseplants

Cast-Iron PlantAspidistra elatior

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Low Light Houseplants

Mock StrawberryDuchesnea indica

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Low Light Houseplants

Sliver Net Leaf


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Low Light Houseplants

Tree PhilodendronPhilodendron bipinnatifidum

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Low Light Houseplants

Heart Leaf, Sweetheart Plant

Philodendron scandens

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Low Light Houseplants


Schefflera arboricola

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Low Light Houseplants

Baby Tears

Soleirolia soleirolii

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Low Light Houseplants

Piggyback PlantTolmiea menziesii

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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)

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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.

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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

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Poisonous Plants

  • Philodendrons– Philodendron sp.

  • Poinsettia– Euphorbia pulcherrima (Common Poinsettia, Christmas Flower)

  • Japanese Privet– Ligustrum japonicum (Waxleaf Privet & other species)

  • Rhododendrons, Azaleas– Rhododendron sp.

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Designed by

Jeanne & Andrea

Supervised by Ron