Plant care calculator

Plant Fertilizer Calculator

By Bougainvillea Editorial Team ·

Analyze your fertilizer NPK ratio to ensure it promotes Bougainvillea blooms rather than just green leaves.

Quick Answer

If your fertilizer has a higher first number (Nitrogen) than the middle number (Phosphorus), it is wrong for a blooming Bougainvillea. The ideal ratio is 1:2:2 or 1:2:1 (e.g., 5-10-10).

Enter your details

Enter the labeled values below. Results appear without leaving this page.

Optional. Enter in °C for Metric or °F for US Standard. If blank, the season selection is used.

Recommended Output

Method

Dose = reference label dose x pot-volume factor x plant nutrient demand x growth-stage modifier x health safety modifier x temperature modifier x selected strength.

Reference Table

Static Bougainvillea NPK Fertilizer Calculator Reference

Visible baseline values

These baseline ratios and decision rules are included directly in the page so visitors can review core guidance before using the interactive calculator.

Scenario Baseline Rule Safety Note
Foliage plant baseline Reference label dose x pot-volume factor x plant demand x stage x health x temperature x selected strength. Apply to moist soil and avoid feeding stressed or recovering plants.
Succulent baseline Use a very dilute balanced feed; demand multiplier is low compared with foliage and flowering plants. Overfeeding succulents is a common cause of weak growth and root stress.
Dormant or recovering plant Recommended output is pause feeding / do not fertilize. Correct light, drainage, pests, or root stress before adding fertilizer salts.

Formula summary: Dose = reference label dose x pot-volume factor x plant nutrient demand x growth-stage modifier x health safety modifier x temperature modifier x selected strength.

The Problem

Many plant owners guess at their care routines, leading to root rot, burned leaves, or stunted growth. Generic advice doesn't factor in specific plant species and local climate.

When to Use This Tool

Use this calculator when you bring home a new plant, when seasons change, or if your plant is showing signs of distress.

Who is this for?

  • Beginner Bougainvillea owners looking to avoid common mistakes
  • Advanced collectors wanting to optimize growth rates

Stop feeding your Bougainvillea the wrong nutrients.

Why NPK Matters

The three numbers on your fertilizer bag represent Nitrogen (N), Phosphorus (P), and Potassium (K). For Bougainvillea, Phosphorus is the most critical element for developing those vibrant, papery bracts (flowers). Potassium ensures strong stems and drought resistance.

Recommended next actions

Next Best Actions

Use the result in a real care workflow with plant profiles, guides, and personalized quizzes.

Guide

Best Fertilizer for Bougainvillea: Feed for Bracts, Not Leaves

Discover the best organic and NPK fertilizers for heavy flowering. Learn how to feed potted bougainvilleas in India using mustard cake (sarson khali), bone meal, and low-nitrogen ratios for maximum color.

Guide

How to Water Bougainvillea Without Killing the Bloom Cycle

Master the ideal watering schedule for Indian climates. Learn dry-down cycles for terrace gardens and balcony pots to prevent root rot during monsoons and trigger heavy blooming in intense summer heat.

Guide

How to Propagate Bougainvillea From Cuttings

A step-by-step guide on how to grow bougainvillea from cuttings. Master propagation using soil or water media during the ideal Indian rainy season for high rooting success rates.

Plant Guide

'Barbara Karst'

Bougainvillea 'Barbara Karst' is a vigorous, popular cultivar prized for its brilliant magenta-red bracts and prolific, nearly year-round blooming habit. One of the hardiest bougainvilleas, it thrives in hot, full-sun gardens, on fences and trellises, and in large containers across tropical and subtropical climates.

Plant Guide

'Elizabeth Angus' (Purple Bougainvillea)

Bougainvillea 'Elizabeth Angus' is a popular and vigorous cultivar prized for its spectacular, deep purple bracts that contrast beautifully with its glossy, dark green foliage. A prolific bloomer for hot, full-sun gardens, fences, and containers across tropical and subtropical climates.

Plant Guide

'Adarna' (Shikendari)

Bougainvillea 'Adarna' (Shikendari) is a rare collector's cultivar prized for its spectacular multicoloured bracts that shift between yellow, orange, and deep pink-magenta. A prolific bloomer for hot, full-sun gardens, fences, and large containers across tropical India.

Fertilizer Calculator Variations & Requirements

VariationLight RequirementWatering FrequencyDifficulty
StandardBright IndirectWeeklyMedium
VariegatedHigh LightWeeklyHard
DwarfMedium LightBi-WeeklyEasy

Troubleshooting Guide

1 Plant is dropping leaves despite following the recommendation

Cause: Drafts, sudden temperature changes, or pest issues not related to the calculator's focus area.

Isolate the plant, check for pests, and ensure it is away from heating/cooling vents.

Glossary of Terms

Transpiration
The process of water movement through a plant and its evaporation from aerial parts.
Photoperiod
The period of time each day during which an organism receives illumination.

Scientific References

  1. Plant Nutrition and Fertilizers — FAO
  2. Understanding Plant Nutrients — NC State Extension

Frequently Asked Questions

What NPK ratio is best for Bougainvillea flowering?
Look for a ratio where the middle number (Phosphorus) is equal to or higher than the first number (Nitrogen). Good options include 5-10-10 or 5-10-5. Avoid 20-20-20 or any formula where N is the dominant element during the blooming phase.
Can I use a tomato fertilizer on Bougainvillea?
Yes — tomato fertilizers are typically high in Phosphorus and Potassium, which makes them surprisingly well-suited for triggering Bougainvillea blooms. Check the label and confirm the middle and third numbers are higher than the first.