House Plants: Proper Care and Problem Solving
- Offers information about cultural considerations. Includes trouble signs and common infectious diseases.
- http://www.ag.ndsu.edu/pubs/plantsci/landscap/pp744w.htm

Interior Plantscaping with Large Houseplants
- Offers instructions for massing green foliage indoors. Includes selections by lighting and problem diagnostics.
- http://www.ag.ndsu.edu/pubs/plantsci/landscap/h1123w.htm

PlantSpecs
- Offers planting, light, temperature and propagation information. Includes search by photo, scientific or common name.
- http://www.plantspecs.com

Houseplant Hydroculture
- Guide to growing houseplants without the use of soil: materials, nutrients, plant care, and FAQs.
- http://www.hydro-culture.net/

AllExperts House Plants
- Offers answers to reader-submitted questions. Includes reader's ratings and comments.
- http://www.allexperts.com/browse.cgi?catLvl=3&catID=721

Fia's Pelargoniums
- Offers information on raising pelargoniums in an apartment. Includes photographs.
- http://hem.bredband.net/pelargonsidan/

Guide to Selecting Houseplants - NebGuide
- Provides information for selecting plants based on environmental conditions. Includes a list of plants and their general requirements.
- http://www.ianrpubs.unl.edu/epublic/pages/index.jsp?what=publicationD&publicationId=236

Indoor Jungle
- Offers techniques and feature articles on topics such as moss poles, winter problems and life spans. Includes FAQ, a photo gallery and a discussion forum.
- http://www.wayswriter.com/indoorjungle/

Avflower.com
- Grower of gesneriads and succulents in Belarus offers personal articles and photo galleries of African violets, streptocarpus, and adeniums. Site in Russian/English/French.
- http://avflower.com/

HPlants.com
- Personal website offers care information and photos on a handful of commonly grown houseplants.
- http://www.hplants.com

All About Houseplants
- Collection of articles, tips, and links on basic houseplant care.
- http://www.all-about-houseplants.com/

Muttart Conservatory: Passionflower Factsheet
- Brief information and care instructions for these tropical vining plants, with emphasis on their use as houseplants. [PDF]
- http://www.edmonton.ca/ArtCultAttr/Passionflower.pdf

PlantOasis.com
- Guide to houseplants, featuring a directory of common species with basic information and a photo for each, articles about care and culture, and Q&A.
- http://plantoasis.com/

Air Plants
- Offers growing and care advice for tillandsias: watering, lighting, fertilizing, mounting, propagation and FAQ.
- http://plants.web-indexes.com/

University of Illinois Extension: Poinsettia Pages
- Poinsettia history, facts, and care, including instructions for reflowering.
- http://www.urbanext.uiuc.edu/poinsettia/index.html

My Hoyas
- Includes photographs and descriptions of the author's hoya collection. [English, Swedish]
- http://www.myhoyas.com

Poinsettia Care in the Home - Ohio State University Extension
- Offers information on watering, light, temperature and reflowering.
- http://ohioline.osu.edu/hyg-fact/1000/1248.html

Potted Plants
- Offers information on identification and care. Includes articles on indoor bulb gardens, bonsai and safety. From Virginia Cooperative Extension.
- http://www.ext.vt.edu/cgi-bin/WebObjects/Docs.woa/wa/getcat?cat=ir-ln-ig-pp

Indoor Plants - Terrariums
- Offers tips on growing in transparent glass or plastic. Topics include containers, soil, placement and care.
- http://hgic.clemson.edu/factsheets/HGIC1457.htm

Indoor Gardening - Insects/Diseases
- Offers articles, news and briefs from the University of Minnesota Extension Service. Topics include bacterial leaf diseases, powdery mildew and root rot.
- http://www3.extension.umn.edu/topics.html?topic=5&subtopic=163

Garden Web House Plants Forum
- Offers a discussion forum. Topics include care, selection and sources.
- http://forums2.gardenweb.com/forums/houseplt/

Misc-Houseplant-Exchange
- Offers a discussion board for trading house plants. Includes some issue discussions.
- http://groups.yahoo.com/group/misc-houseplant-exchange/

Gardenline House Plants
- Offers growing and care advice from the University of Saskatchewan. Includes growing from seeds, humidity, using pure water as well as detailed information for several specific plants.
- http://gardenline.usask.ca/plants/index.html

Spaths.com
- Offers information about growing the Peace Lilly indoors. Includes care, varieties and FAQ.
- http://www.spaths.com/

I Can Garden Houseplants
- Offers feature articles. Topics include repotting, seasonal tips, checking seeds and non-toxic pesticides.
- http://www.icangarden.com/document.cfm?task=viewcategory&categoryid=37

PlantCare.com
- Offers a database of over 2,000 species and genera of indoor plants. Includes common pests, photographs and a bulletin board. Paid subscription required for some information.
- http://www.plantcare.com

Houseplants - University of Illinois Extension
- Offers information on topics including needs, selection, care, health and propagation. Includes types by botanical and common name and by light requirements.
- http://www.urbanext.uiuc.edu/houseplants/

Caring for Flowering and Foliage House Plants - The Garden Helper
- Offers information on topics including dish gardens, terrariums, indoor topiaries, repotting, pests and toxic plants. Includes a glossary, botanical names and guides to individual species.
- http://www.thegardenhelper.com/houseplants.html

House Plants
- Offers information on air-cleaning and poisonous plants. Includes details toxicity and risks.
- http://www.blankees.com/house/plants/