Gardening Tools — Free Online

Find the best time to sow seeds indoors and outdoors for vegetables and flowers by month.

Calculate the actual nitrogen, phosphorus, and potassium content from a fertilizer NPK ratio and application weight.

Calculate how many plants fit in a bed and optimal spacing from bed dimensions and plant spacing requirements.

Estimate how often and how much to water your plants based on species, pot size, season, and climate.

View current and upcoming moon phases and get gardening recommendations for sowing, pruning, and harvesting.

Look up companion planting relationships: which plants help each other grow and which should be kept apart.

Enter the weights of your brown and green materials to calculate the carbon-to-nitrogen ratio and get composting advice.

Enter your soil pH and see which vegetables, fruits, and flowers grow best, plus which amendments to add.