r/hydro rules, stats, and what to post

R/hydro is a home for hydroponic cannabis gardeners, and the community invites three things above everything else, which are grow journals, questions, and discussions. It exists for people growing their own plants at home, and the rules spell out that professional growers are not part of this crowd. Everything shared must sit squarely inside hydroponic growing, meaning roots fed by a salt based nutrient solution rather than living soil. Coco coir gets accepted, but only while it stays purely mineral fed, because adding worm castings or other organic material pushes a setup out of scope. Growers working in soil are pointed toward other communities instead. So picture hobbyists documenting reservoirs, lights, nutrients, pH readings, and harvest results, and helping each other troubleshoot along the way.

“No Advertising or Direct Linking (Unless specifically requested.)” is the big one for any founder, because it blocks links to products and sites unless a member actually asks for them, and it also forbids links to social media accounts. “No Stolen Content, Bot Posts, AI posts” means anything that smells automated or machine made is gone. “No YouTube link posts.” stops you opening a thread with your own video, though replying with a video link when someone asks is fine. “No buying, selling, trading” covers seeds, weed, clones, extracts, equipment, pricing, and supplier talk. “No asking for DM” kills the classic move of telling people to message you privately. “No bud porn, karma farming, or low effort posts.” requires posts that spark conversation. “Hydroponic grows only” and “Off topic post” set the topical boundary, and soil goes elsewhere. “Be Civil (No Harassment - Personal Attacks - Insults)” sets the tone standard.

A good post here is a genuine contribution to someone else's learning curve, told from your own hands-on experience. Share a detailed grow journal entry covering your system, your nutrient mix, your light schedule, and what went wrong and right during the week. Ask a focused technical question about EC levels, root health, deficiency symptoms, or strain behavior in a hydro setup, framed so others can weigh in with specifics. Offer troubleshooting help when someone posts a struggling plant, drawing on problems you personally solved. Reply generously in threads where members discuss methods, and let credibility accumulate quietly over time. If someone eventually asks what equipment or tools you rely on, then, and only then, sharing a link becomes permissible under the rules.

Any kind of promotion gets pulled fast, and that includes advertising, buying, selling, trading, and asking people to take conversations private. Links are conditional, so posting a link to your product, your site, or your social channels without being asked fails the rules, and opening a new post with a YouTube link does too. AI generated content is treated the same as stolen content and bots, so leave it entirely out of your workflow here. Anything off the hydroponic topic gets removed, and asking where to obtain seeds falls under that umbrella. Low effort shots of buds with no question attached count as bud porn and vanish. Keep in mind the sub welcomes home growers only, so framing matters if you run any kind of larger operation.

I find it refreshing that this community states plainly why it bans ads, namely to stop unrequested link spam, instead of leaving everyone guessing. What stands out most is how thoroughly the commercial exits are sealed, with buying, selling, trading, seed sourcing, and DM requests all covered by different rules. That tells me the only real currency here is a documented grow, and honestly that suits me fine.