A source-backed Rankhog guide to r/Greenhouses: public rules, community context, posting fit, and startup-promotion risk before you publish.
By Anthony Riera, founder and operator of Rankhog.
Subreddit guides combine public Reddit source URLs, captured rules, visible verification dates, and Rankhog's account-safety workflow.
Current public stats
Rules can change, so Rankhog keeps verification dates and the original public Reddit sources visible.
This is a community for people who discuss and celebrate greenhouses and cold frames. The scope is written narrowly on purpose. A greenhouse is a structure built to protect tender or out-of-season plants, with transparent or translucent walls and a roof, usually made of glass or plastic. A cold frame is a miniature greenhouse. So the room is for people who build, buy, maintain, or grow things inside these structures, and they come here to share builds, ask questions, and show what they are growing under glass or plastic. Anything outside that frame gets removed.
The gatekeeper is “Posts must be related to greenhouses or cold frames”, which defines a greenhouse as a structure for protecting tender or out-of-season plants with transparent or translucent walls and roof, typically glass or plastic, and a cold frame as a miniature greenhouse. Then “No promotions, advertisements, or surveys” kills any post that promotes your service, company, or product, and it also bans surveys, fundraisers, and market research. “No click farming or AI content” bans driving traffic to your YouTube or other social media accounts, bans AI content, and requires every video to come with a text post or starter comment that summarizes the video and gives context. Finally “Be nice” removes rudeness and harassment, which matters if you plan to reply to people in the comments.
A good post here is about the structure or the growing inside it, with no hint of selling. If you are a founder, the honest play is to participate as a person, not as a brand. Show your own greenhouse or cold frame build, share a problem you solved like condensation, heating, or glazing choices, or ask a genuine question about your own setup. Photos of a real structure with a plain text explanation of what you did and what you learned fit the room well. If you share a video, write a text post or a starter comment that summarizes it and gives context, because the rules demand that. Answer other people's questions generously before you ever think about posting anything of your own.
The fastest removal is any form of promotion, advertisement, survey, fundraiser, or market research, because the rules ban all of it in one rule. Do not post AI content, and do not treat the sub as a traffic source for your YouTube channel or other social accounts. If you post a video at all, it needs a text post or a starter comment that summarizes the video and provides context, or it fails the rule. Off topic posts that are not about greenhouses or cold frames get removed too. And keep your tone civil, because rudeness and harassment are not tolerated here.
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Only if the post itself is about a greenhouse or cold frame and there is zero promotion of your company or product, because “No promotions, advertisements, or surveys” bans promotion outright.
Yes, but the rule requires a text post or a starter comment that summarizes the video and provides context, so never post a bare link.
No, the rules ban surveys and market research in the same breath as promotions and advertisements.
No, “No click farming or AI content” bans AI content and any attempt to drive traffic to your YouTube or other social accounts.
Yes, as long as it centers on the structure itself, since the rules define a greenhouse as a protective structure with transparent or translucent walls and roof, typically glass or plastic.
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