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metadata 
title: Waterleaf
emoji: 🌿
colorFrom: green
colorTo: red
sdk: docker
app_port: 7860
hf_oauth: true
hf_oauth_expiration_minutes: 43200
license: mit
short_description: Plant ID and weather-aware watering calendars
tags:
  - track:backyard
  - sponsor:modal
  - sponsor:openai
  - achievement:llama
  - achievement:fieldnotes
  - achievement:bestdemo

Waterleaf

Waterleaf identifies an outdoor garden plant from one to three photographs, grounds the result in a plant taxonomy database, builds an editable weather-aware watering plan, and exports one 30-day calendar for the garden.

Built by Hakan Karaoguz (hkaraoguz) for the 2026 Hugging Face Build Small Hackathon.

Workflow

  1. Upload or capture one to three photographs of one plant.
  2. Gemma 4 extracts visible traits and proposes likely names.
  3. GBIF resolves those names to valid plant species.
  4. Gemma reranks only the valid records.
  5. Confirm or replace the species through autocomplete.
  6. Preview weather-adjusted dates and edit them.
  7. Save plants and export one whole-garden ICS file.

Architecture

  • UI and web: Gradio Blocks mounted in FastAPI
  • Authentication: Hugging Face OAuth
  • Persistence: Local SQLite with an HF Storage Bucket snapshot, plus bucket-backed JPEGs and calendar exports
  • Vision model: ggml-org/gemma-4-26B-A4B-it-GGUF
  • Runtime: llama.cpp server-cuda13-b9445 on a Modal L4
  • Taxonomy: GBIF Species API
  • Care data: Small local baseline catalog with manual interval fallback
  • Weather: Open-Meteo geocoding and 16-day forecast
  • Calendar: RFC 5545-compatible ICS with stable UIDs, alarms, profile URLs, and image attachments

See docs/architecture.md for the data flow and privacy boundaries.

Local Development

Python 3.11-3.13 and uv are supported.

uv sync
uv run uvicorn app:app --host 0.0.0.0 --port 7860

Open http://localhost:7860. Without MODAL_ENDPOINT, Waterleaf uses a deterministic lavender demo identifier. Local persistence uses the local-gardener identity and data/ directory.

Run checks:

uv sync
uv run pytest
uv run ruff check .

Modal Deployment

1. Authenticate the Modal CLI

Install the deploy dependency and connect the local CLI to the Modal workspace:

uv sync --group deploy
uv run --group deploy modal setup

2. Deploy llama.cpp

Deploy the protected GPU service:

uv run --group deploy modal deploy modal_app.py

The Modal service:

  • uses the pinned ghcr.io/ggml-org/llama.cpp:server-cuda13-b9445 image;
  • starts Gemma 4 26B-A4B Q4_K_M with automatic multimodal projector download;
  • uses an 8K context, full GPU offload, Flash Attention, Q8 KV cache, and one parallel slot;
  • uses a bounded 256-token thinking pass for database-candidate reranking while keeping initial visual extraction non-thinking and schema-constrained;
  • caches Hugging Face artifacts in a Modal Volume;
  • requires Modal proxy-auth headers.

The command prints the modal.run URL. Save it as MODAL_ENDPOINT.

For the live demo and judging window, keep one container warm:

MODAL_MIN_CONTAINERS=1 uv run --group deploy modal deploy modal_app.py

Return to zero warm containers after judging to stop idle GPU spend:

MODAL_MIN_CONTAINERS=0 uv run --group deploy modal deploy modal_app.py

3. Create proxy credentials

In Modal Workspace Settings, create a Web endpoint proxy auth token. Save the token ID as MODAL_KEY and token secret as MODAL_SECRET. These are not the same credentials used by modal setup.

Test the endpoint before configuring the Space:

MODAL_ENDPOINT=https://...modal.run \
MODAL_KEY=wk-... \
MODAL_SECRET=ws-... \
uv run python scripts/smoke_modal.py assets/sample-lavender.png

If a proxy token has not been created yet, a controlled one-time smoke test can temporarily publish the endpoint:

MODAL_PROXY_AUTH=0 MODAL_MIN_CONTAINERS=1 \
  uv run --group deploy modal deploy modal_app.py
MODAL_ENDPOINT=https://...modal.run \
  uv run python scripts/smoke_modal.py assets/sample-lavender.png
MODAL_PROXY_AUTH=1 MODAL_MIN_CONTAINERS=0 \
  uv run --group deploy modal deploy modal_app.py

The middle deployment is unauthenticated and should exist only for the smoke test. Always run the final restore command immediately afterward.

Space Configuration

1. Create the Space

Create build-small-hackathon/waterleaf in the Hugging Face UI with:

  • SDK: Docker
  • Visibility: Public
  • License: MIT

If the hackathon organization does not allow direct creation, create hkaraoguz/waterleaf first and transfer or duplicate it into the requested hackathon namespace.

The root README metadata already enables Docker on port 7860 and HF OAuth.

2. Upload this repository

Authenticate the Hugging Face CLI and upload the working tree. The CLI sends binary assets through Xet storage, which a plain Git push does not:

hf auth login
hf upload build-small-hackathon/waterleaf . . \
  --repo-type space \
  --exclude '.git/**' \
  --exclude '.venv/**' \
  --exclude '.pytest_cache/**' \
  --exclude '.ruff_cache/**' \
  --exclude '**/__pycache__/**' \
  --exclude '*.pyc' \
  --exclude 'data/**' \
  --exclude '.env'

Do not commit or upload local environment files or deployment secrets.

3. Attach persistent storage

In Space Settings → Storage Buckets:

  1. Create or select a bucket for Waterleaf.
  2. Attach it read-write.
  3. Set the mount path to /data.

The Docker image sets WATERLEAF_DATA_DIR=/data for bucket-backed media, exports, and database snapshots. It keeps the live SQLite file under WATERLEAF_DATABASE_DIR=/tmp/waterleaf-db so SQLite uses local container disk instead of the bucket mount for file locking. Without the bucket mount, images, calendar exports, and saved-garden snapshots disappear when the Space restarts.

4. Configure secrets and variables

In Space Settings → Variables and secrets, add:

Name Type Required Purpose
MODAL_ENDPOINT Secret Production Protected llama.cpp base URL
MODAL_KEY Secret Production Modal proxy token ID
MODAL_SECRET Secret Production Modal proxy token secret
PUBLIC_BASE_URL Variable Optional Override the derived Space URL
WATERLEAF_DATA_DIR Variable No Defaults to /data in Docker
WATERLEAF_DATABASE_DIR Variable No Defaults to /tmp/waterleaf-db in Docker

Use only the base Modal URL for MODAL_ENDPOINT; do not append /v1/chat/completions.

5. Rebuild and verify

Trigger Factory reboot after attaching storage or changing secrets. Then verify:

curl --fail https://build-small-hackathon-waterleaf.hf.space/health

Expected response:

{"status":"ok"}

Open the Space directly, not only inside the Hub iframe, and check:

  1. Sign in with Hugging Face completes successfully.
  2. A guest can preview one identification.
  3. A signed-in user can save a plant and see it after a factory restart.
  4. The generated ICS downloads and its public plant/image links open.

Guests may run one temporary identification preview. Login is required to save, delete, or export plants.

Evaluation

Populate evaluation/manifest.csv with at least 20 consented real-garden examples and run:

MODAL_ENDPOINT=... MODAL_KEY=... MODAL_SECRET=... \
  uv run python scripts/evaluate.py evaluation/manifest.csv

The report includes species top-1/top-3 accuracy, genus top-1 accuracy, per-case predictions, and latency. A live one-to-three-photo smoke test is available at scripts/smoke_modal.py.

Privacy and Limitations

  • Images are resized, converted to JPEG, and stripped of EXIF.
  • Stored coordinates are rounded and never exposed on public plant pages.
  • Public pages use opaque slugs but are intentionally public for calendar use.
  • Plant identification and watering dates are suggestions, not horticultural guarantees.
  • If forecast retrieval fails after location resolution, Waterleaf still generates dates from the care baseline and labels them as seasonal estimates.
  • Geocoding failure stops schedule preview until the location is corrected.
  • Dates after the 16-day forecast are labeled seasonal estimates.
  • ICS ATTACH support varies by calendar client; every event also includes a portable public profile link.
  • Users must provide a manual interval when the local catalog has no care baseline for the selected species.

Submission Materials

Target categories: Backyard AI, Best Demo, Llama Champion, Modal-powered, and Field Notes. Waterleaf does not claim Off the Grid because inference, taxonomy, and weather are cloud-hosted.

Team

Credits