Seed & Garden Planner: Planting Schedules & Seed Calculators

Turn seed packets into a planting plan

Seed & Garden Planner

Calculate planting positions, prepare a seed allowance and build a sowing calendar. Use the spacing, germination rate and maturity instructions for your chosen variety.

1. Choose your planting batch

Crop Variety or batch name — optional Sowing method Growing area

Use the planting method and timing on your seed packet.

2. Calculate plant positionsPlanning mode

Bed dimensions unit Inside bed length Inside bed width Spacing unit Final plant spacing along a row Final spacing between rows Edges Compare row directions and use the one with more positions

Target plants per batch — optional

Enter your variety's final spacing. The initial dimensions and 30 cm spacings demonstrate a sample layout.

3. Prepare your seed quantity

Packet germination rate (%) — optional Spare plants to prepare (%) Number of planting batches

Seed allowance uses your germination rate. Spare plants are added to each batch before calculating seeds.

Include a thermostat-controlled heat mat in my indoor setup

Add a sowing calendar

Calendar starting point

Enter the indoor lead time and maturity details from your packet. For repeat batches, prepare a fresh area or replace a finished crop.

Example planting plan

My planting batch

Plants per batch32

Plants including spares36

Seeds per batchEnter packet rate

Seeds for all batchesEnter packet rate

4 rows × 8 positions = 32 planting positions.

Sample layout: 32 positions with half-spacing around the edges.

Add a calendar starting point to generate dates.

Batch preparation checklist

Confirm the variety and packet spacing.Prepare and label the planting positions.

Prepare Your Sowing Supplies

Gather the growing medium, labelled containers and watering tools for your next batch.

Seed-starting mix

Prepare medium for an indoor seed-starting batch.

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Vented seed-starting trays

Sow in labelled cells with adjustable humidity covers.

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Plant labels and marker

Label the crop, variety, batch and sowing date.

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Clip-on grow light

Light a small indoor seedling setup.

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Practical Digital Guides

Build on your planting plan with seed-starting methods, growing routines and harvest projects.

The Complete Indoor Plant Bible | Step-by-Step Illustrated Guide

$9.99

View guide →

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Seed & Garden Planner FAQ

Which spacing belongs in the calculator?

Use your variety’s final plant and row spacing. Choose half-spacing edges or a minimum margin. Rows are centred within the bed.

How is the seed allowance calculated?

Target plus spares is rounded up to whole plants. Divide that count by your germination rate and round up to whole seeds. Each batch repeats this allowance.

How does the calendar use a frost date?

Your frost date plus your chosen offset sets outdoor planting. Indoor sowing is counted back by your lead time.

How do maturity dates work?

Enter packet maturity and its starting point: sowing or outdoor planting. Results show first flowers or first harvest.

Can I plan several sowings?

Choose up to twelve batches and an interval. Each repeats the target and seed allowance. Prepare growing space for each batch.

What happens if I leave germination or dates blank?

Blank germination leaves a layout and spare-plant count. Add the packet rate for seeds and a calendar starting point for dates.

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