How to Use Claude as a Garden Planner: The Ruben Skill Guide

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Skill · .md

The skill behind this guide: Ruben - Garden Planner AI Skill. Holds your plot between seasons - aspect, soil, frost dates, what thrived and what died - so next year builds on this year instead of starting again - $19, one payment, yours permanently.

View the Ruben skill →

A model will happily hand you a month-by-month sowing calendar for your garden, and it will be wrong, because it does not know the one number the whole calendar hangs on: your last frost date. Everything below is built around supplying what it cannot know, and refusing the confident answers where it is guessing. Works in Claude, ChatGPT or any AI chat.

0:15 · loop Same AI, same question. One file makes it a specialist.

A hardiness zone is not a planting date

This is the single most common confusion in AI gardening advice, and it is worth getting straight before anything else, because it quietly ruins calendars.

The USDA Plant Hardiness Zone Map, updated in 2023, is built from the average annual extreme minimum winter temperature, shown as 10-degree Fahrenheit zones and 5-degree half zones. That tells you one thing: whether a perennial is likely to survive your winter. It tells you nothing about when your spring starts, how long your season is, or how hot your summer gets. Two places in the same zone can have last frosts six weeks apart.

What actually drives a sowing calendar is your last spring frost and first autumn frost, which are a different dataset entirely and are local enough to vary across one town. So the correct order is: look up your own frost dates once, from your national met service or a local extension or gardening body, write them down, and then hand them to the model as facts. Never ask it for them.

Two more traps in the same family. Outside the US the zone system is not the one people use: the UK works from the RHS hardiness ratings, and other countries have their own schemes, so a model reaching for "zone 7" for a European garden is applying the wrong instrument. And because the map was updated in 2023, a model may be repeating an older figure for your area. If the zone matters to your decision, check the current map rather than accepting a remembered number.

The hemisphere problem, which nobody warns you about

Ask for a planting calendar without saying where you are and you will get one, in months, pitched at a Northern Hemisphere temperate climate and usually a US one. It will not tell you it has assumed this. For a garden in Australia, New Zealand, South Africa or southern South America, every month in it is roughly six months out, and the advice reads perfectly.

The fix is a habit rather than a clever prompt: never accept a calendar written in month names. Ask for it in weeks relative to your last frost date, and convert to real dates yourself. That single change makes the output portable, checkable and much harder to get silently wrong.

What it cannot see, and what it invents

Two separate problems. The first is missing information, which you can fix by supplying it. The second is confident invention, which you fix by forbidding it.

Task Verdict Why
Turning your own observations into a plan, a bed layout or a job list Genuinely good It is structuring and sequencing, which is what it is best at
Succession planting and keeping a bed productive Genuinely good Scheduling against dates you supply, with no facts of its own required
Explaining a technique, a term or why something is done Good, with a second source Well-covered ground, and you can check it in a minute
Scaling ambition to a balcony, a small bed or a first allotment Good The honest answer is usually "grow fewer things", and it will say so if you ask it to
Telling you your frost dates, zone, or this year's weather No It does not have them. It will produce a plausible number anyway
Days to maturity, spacing, sowing depth, variety names Check the packet These vary by variety and the packet in your hand is the authority. Invented variety names are common
Diagnosing a sick plant from a description No Half a dozen problems look identical in words. Ask a local nursery or a plant clinic
Anything you will eat, forage or treat with a chemical Never Identification and pesticide decisions need a qualified local source, not a chat window

Worth naming one invention specifically, because it sounds authoritative and gets repeated everywhere: companion planting. Some of it has evidence behind it, and a great deal of it is garden folklore passed down as fact. A model has read all of it and cannot tell you which is which, so it will give you a confident pairing table with no distinction between the tested and the traditional. Treat any companion claim as a thing to look up, not a rule.

Prompt 1 - the site survey, which is the actual work

Everything downstream depends on this, and it takes one afternoon of looking rather than any typing. The prompt is written to interview you and to refuse to proceed on guesses.

Help me survey my growing space before we plan anything. Ask me one question at a time and do not move on until my answer is specific. Do not suggest plants yet. Get out of me: 1. Where I am: country, region, and my LAST SPRING FROST and FIRST AUTUMN FROST dates. If I do not know them, tell me to go and look them up and stop. Do not estimate them. 2. The space: dimensions, and whether it is ground, raised beds, containers or a balcony. 3. Sun: how many hours of direct sun each area gets, and at what time of day. If I have not actually watched it, say so and tell me to check morning, midday and late afternoon. 4. Soil: what it feels like wet and dry, how fast water drains after rain, and whether anything is already growing well. 5. Wind and shelter, including whether any part is a frost pocket at the bottom of a slope or against a cold wall. 6. Water: how it gets there, and who does it in August. 7. Me: hours a week, realistically, and the weeks I am away. Then write it back as a one-page SITE BRIEF I can paste into future conversations, and list the three things I still need to observe before the plan is trustworthy.
Skill spotlight
Ruben - Garden Planner AI Skill
Ruben - Garden Planner AI Skill
$19this skill

Keeps the site brief between sessions - your frost dates, aspect, soil, what you planted and what died - which is the whole point for a project measured in years rather than conversations. It asks for the survey before it plans, works in weeks relative to your frost dates rather than month names, and marks what it does not know instead of filling it in.

View Ruben - Garden Planner →

Prompt 2 - a calendar anchored to your dates, not to months

Build me a sowing and planting calendar from the site brief below, plus this list of what I want to grow. Hard rules: - Express every date as WEEKS BEFORE or AFTER my last spring frost, or my first autumn frost. Never use a month name. - Use only the frost dates in my brief. Do not adjust them, do not average them with anything, and do not comment on whether they seem right. - For each crop give: sow indoors, sow direct, plant out, and expected first harvest, all as relative weeks. - Where a timing depends on the variety, write [CHECK YOUR PACKET] rather than giving me a number. - Flag every job that must happen while I am away, from the weeks I listed. - At the end, list what I am trying to grow that is a poor fit for my conditions, and say plainly which ones to drop this year. Do not soften this. SITE BRIEF: [PASTE] WHAT I WANT TO GROW: [PASTE]

Prompt 3 - the bed plan, with the numbers left to you

Lay out my beds from the site brief and the crop list below. For each bed: what goes where, in what order through the season, and what follows what when it comes out. Rules: - Put tall things where they will not shade short things, given the sun directions in my brief. Say which way you assumed. - Do not state spacings or plant counts. Write [SPACING: packet] and leave me to fill it in, then recalculate the fit once I give you real numbers. - Plan succession: for every bed, what is sown to replace each crop as it finishes. - Note anything that will need support, netting or a path to reach it, and where the path goes. - If a crop in my list does not fit anywhere sensible, say so rather than squeezing it in. - Any companion-planting pairing you suggest must be labelled either WELL SUPPORTED or TRADITIONAL, and say plainly when you are not sure which. SITE BRIEF: [PASTE] CROPS: [PASTE]
For the building half of a garden
Lars - DIY & Home Improvement AI Skill
Lars - DIY & Home Improvement AI Skill
$19this skill

A plot is half planting and half construction: raised beds, paths, a compost bay, fixing the fence the wind took out. Lars handles the materials list, the cut list and the order of work, and tells you which jobs are not a first project.

View Lars - DIY & Home Improvement →

Prompt 4 - the review that makes next year better

This is the one that compounds, and the reason a garden is worth keeping notes on at all. Run it once, at the end of the season, while you still remember.

Help me review the season and produce notes I will actually use next year. Ask me about each crop in turn, briefly. For each one I want recorded: what I sowed and when, relative to my frost dates; what happened; and my honest verdict - grow again, grow differently, or never again. Then produce a SEASON RECORD containing: - what worked, with the specific reason I gave, not your theory - what failed, and which of my observations explain it - the three changes with the largest effect for the least work - what I should sow earlier or later next year, in relative weeks - anything I said about my own behaviour, such as jobs I did not get round to, that the plan should design around rather than assume away Do not add gardening advice I did not ask for, and do not explain failures with causes I did not observe. If my notes do not explain something, write UNEXPLAINED and leave it.

Where it fails

  • Frost dates and zones. It does not have yours. Asked, it will produce a plausible number. Look them up once, write them down, and treat them as input rather than output.
  • Month names. The silent hemisphere assumption. Insist on weeks relative to frost.
  • Variety names and packet numbers. Invented cultivars are common, and days-to-maturity and spacing vary by variety anyway. The packet in your hand outranks the chat.
  • Companion planting. Folklore and evidence arrive in the same confident table. Ask it to label which is which, and check anything that matters.
  • Plant identification and plant health. Not from a description, and never for anything you intend to eat.
  • Optimism about your time. Left alone it plans the garden of someone with more free weekends than you. Tell it your real hours and the weeks you are away, and make it design around them.
  • This year. It knows nothing about the actual weather. A late cold spring beats any calendar, and the plant is the better guide than the plan.

How do you install the Ruben skill?

The download is a ZIP with SKILL.md at the root of the archive, not inside a nested folder - that folder structure is the usual reason an upload fails. In the Claude desktop app, open Customize → Skills, upload the ZIP and toggle it on. Claude loads it whenever your request matches what it covers.

Skills need code execution enabled, under Settings → Capabilities. Anthropic's help centre currently lists Skills on Free, Pro, Max, Team and Enterprise, while its Academy tutorial lists Pro, Max, Team and Enterprise - so if you are on the free plan, check Settings → Capabilities for your own account rather than taking either page's word for it. The full walkthrough is in the skill installation guide.

In ChatGPT or Gemini there is no upload step: open SKILL.md, copy the contents, and paste them into custom instructions. You lose automatic triggering and keep the method.

Who is this for?

First-time growers who want something achievable rather than a master plan they abandon in June, balcony and container gardeners, allotment holders planning a season, and anyone who has been gardening for years and wants the record-keeping done properly for once. It works in Claude, ChatGPT or any AI chat.

The rest of the household side of the catalogue, each a one-time download:

The wider sets are the travel, food & home skills and personal & lifestyle skills, with ready-made prompts in food & home prompts.

In summary:

Look up your last and first frost dates once and treat them as facts you supply, never as something to ask for. Refuse any calendar written in month names and insist on weeks relative to frost, which removes the silent hemisphere assumption. Let the model structure, sequence and remember; let the seed packet, a local source and the plant itself settle the numbers. For the plan that survives between seasons, Ruben - Garden Planner AI Skill ($19); for the building half, Lars - DIY & Home Improvement ($19). Both work in Claude, ChatGPT and any AI chat, with a 30-day money-back guarantee.

Skill · .md · Works with Claude & ChatGPT

Ruben - Garden Planner AI Skill

One file that asks for the site survey before it plans, works in weeks relative to your own frost dates rather than month names, sends you to the packet for the numbers, and carries your plot from one season into the next. No subscription. Yours permanently.

$19
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Frequently asked questions

Can I use Claude to plan my garden?+

Yes, for the parts that are structuring, sequencing and remembering: turning your own observations into a bed layout, planning succession so a bed keeps producing, scaling ambition to the space and time you actually have, and keeping a record from one season to the next. Not for the facts about your specific plot, which it does not have. The method is to supply what it cannot know and forbid it from filling the gaps.

Is a hardiness zone the same as a planting date?+

No, and confusing them is the most common error in AI gardening advice. The USDA Plant Hardiness Zone Map, updated in 2023, is built from the average annual extreme minimum winter temperature, shown as 10-degree Fahrenheit zones and 5-degree half zones. That tells you whether a perennial survives your winter and nothing about when your spring starts or how long your season is. Two places in the same zone can have last frosts six weeks apart. Sowing calendars run off frost dates, which are a separate dataset.

Can AI tell me my last frost date?+

No, and this is the important one. It does not have your frost dates, but asked for them it will produce a plausible-looking answer anyway, and your whole calendar then hangs off a guess. Look up your last spring frost and first autumn frost once, from your national met service or a local extension or gardening body, write them down, and hand them to the model as facts it must use rather than something it should estimate.

Why is the AI planting calendar wrong for my country?+

Because a calendar written in month names carries a silent assumption. Ask without saying where you are and you get a Northern Hemisphere, usually US, calendar, and it will not tell you it assumed that. For a garden in Australia, New Zealand, South Africa or southern South America every month is roughly six months out while the advice reads perfectly. Also, outside the US the zone system is different: the UK uses RHS hardiness ratings. Insist on weeks relative to your frost date rather than month names.

Is AI companion planting advice reliable?+

Treat it as a list of things to look up rather than rules. Some companion planting has evidence behind it and a great deal of it is garden folklore repeated as fact. A model has read both and cannot tell you which is which, so it produces a confident pairing table with no distinction between the tested and the traditional. A useful instruction is to make it label every pairing as either well supported or traditional, and to say when it is not sure.

Can AI tell me plant spacing and days to maturity?+

Check the packet. These vary by variety, the packet in your hand is the authority, and invented cultivar names are a common failure. A better pattern is to have the model write a placeholder such as CHECK YOUR PACKET or SPACING: packet, then recalculate the bed layout once you give it the real numbers from the seed you actually bought.

Can AI diagnose what is wrong with my plant?+

No. Half a dozen different problems look identical in a written description, and it cannot see the plant, the soil or the weather it has had. A local nursery, a plant clinic or a gardening society will do better in two minutes. This goes double for anything you intend to eat, for foraging identification, and for any decision about applying a chemical, all of which need a qualified local source.

How do I install the Ruben Garden Planner skill?+

The download is a ZIP with SKILL.md at the root of the archive, not inside a nested folder. In the Claude desktop app open Customize then Skills, upload the ZIP and toggle it on. Skills need code execution enabled, under Settings then Capabilities. Anthropic's help centre currently lists Skills on Free, Pro, Max, Team and Enterprise, while its Academy tutorial lists Pro, Max, Team and Enterprise, so if you are on the free plan check Settings then Capabilities for your own account rather than trusting either page. In ChatGPT or Gemini, paste the contents of SKILL.md into custom instructions instead.

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