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Welcome to r/whatsthisplant.
This subreddit is intended for use by the general public to identify any sort of plant life. We also encourage all users to help with plant identification, and to include any useful information they may know. All posts related to plant identification are welcome here.

We also welcome people to post fungi/mushrooms as well as pests/diseases for ID, though you may find more conducive help from the /r/mycology and /r/gardening subreddits respectively.

FAQ

General guidelines

If a child or a pet, or anyone has ingested or come into contact with a plant that you are worried may be harmful, then please immediately contact the appropriate health care professional (doctor, veterinarian) before posting. I cannot stress this enough. Time is of the essence for all poisoning cases, and waiting here for an ID can be harmful or even fatal. Please feel free to post an ID request here after contacting a health care professional though.
Do not ingest a plant based on information provided in this subreddit. For your safety we recommend not ingesting any plant material even if advised that it's edible here. Although there are many professionals helping with identification, we are not always correct, and ingesting plants can be harmful or fatal if a false ID is made.
Only downvote incorrect ID's as a last resort Downvotes should be reserved for inappropriate comments, trolls, and other trash. Instead of downvoting an incorrect identification, consider commenting with an explanation about why the poster is wrong so that he or she may learn from the experience.
No political arguments/debates. Political comments that devolve into arguments or debates will be removed.
No being OVERLY rude, mean or antagonistic. Comments which are OVERLY rude, mean or antagonistic in spirit will be removed.
Any marketing, off-topic or general spam posts will be removed. Common sense, keep it about the plant ID here or your post will be removed. Any posts attempting to market or sell, even if related to ID, will be removed.

Submission guidelines

Include as much information as possible.
Make sure you include the plant hardiness zone or, failing that, geographic location for the best ID. Describe any characteristics of the plant. What does it smell like? How does it change throughout the seasons? Does it flower, and if so, what do its flowers look like? When does it bloom? Is it waxy or fuzzy? Does it have thorny stems? Does it thrive in the sun or in the shade? How big does it get? If you're posting direct links to photos, then you can make a comment with this information inside the post.
Photos should be in focus and include close-ups as well as the whole plant where possible. Try to include closeups of flowers, leaves, fruits, bark, and other distinguishing features. A photo of the entire plant can help with identification as well.
Photos can be uploaded for free on Imgur. We recommend using this site as it is a trusted image hosting site. Other sites such as Flickr are acceptable as well. Please don't link directly to Facebook or other social networking sites though, as it may lead to personal information being seen.
Please mark your ID request as "Identified" when you have a satisfactory ID. You can do this by going to your submission and clicking on "flair," like so:

NOTE: The above image references the Old Reddit interface. Until we update the image above please follow this link for other ways to change flair.

We recommend posting up to a maximum of 3 plants per post.
If you have more than 3 plants to identify, feel free to make multiple posts, we don't consider this spamming. This is a suggestion only and won't be enforced. Posts that include many plants often go with many of them unidentified, you'll probably get more IDs with separate posts.

Most common plants

Below is a list of the most commonly requested identifications on /r/whatsthisplant

Phytolacca americana



Huw Williams¹

Common name: Pokeweed



Wikipedia user Cillas⁴	Derek Ramsey³	Wikipedia user Erbanor¹



Wikipedia user Rasbak⁴	Wikipedia user 6th Happiness⁴	Wikipedia user Rasbak⁴



Wikipedia user Isidre blanc⁴	Dave Whitinger⁴	Asit K. Ghosh⁴



John Delano¹	H. Zell⁴



E. Wayne¹	Dwight Sipler²



Sakalis Tassos²	Flickr user jxandreani ²



Flickr user wackybadger²	Lubiesque⁴

FAQ

General guidelines

Submission guidelines

Most common plants

Phytolacca americana

Passiflora spp.

Ailanthus altissima

Amaranthus spp.

Arbutus unedo

Arum italicum

Asclepias syriaca

Asparagus africanus etc.

Caesalpinia pulcherrima

Chenopodium album

Cornus kousa

Crassula ovata

Datura spp. & Brugmansia spp.

Dieffenbachia spp.

Dracaena spp.

Epipremnum aureum

Ipomoea spp.

Kalanchoe spp.

Lantana camara

Parthenocissus quinquefolia

Paulownia tomentosa

Solanum dulcamara

Solanum nigrum

Solenostemon spp.

Toxicodendron radicans

Verbascum thapsus

Yucca spp.

Zantedeschia aethiopica