Bougainvillea Fertilizer
Bougainvillea fertilizer with a bloom-weighted 3-3.6-5.1 NPK, kelp, and eight added minerals — made to drive heavy, repeat bract displays instead of a wall of green. Phosphorus and potassium lead the ratio to push flowering, while restrained nitrogen keeps the plant from running to vine growth at the expense of color.
How to Use Bougainvillea Fertilizer
| Method | Amount | How Often |
|---|---|---|
| Watering can | 2 Tbs (30 mL) per gallon of water | Spring & summer: every 1–2 weeks |
| Watering can | Same dilution | Fall & winter: every 2–4 weeks |
| Hose end sprayer | Set dial to 1 oz (30 mL) setting | Spring & summer: every 1–2 weeks |
| Leaf misting (optional) | 1 tsp per quart (32 oz) of water | Every 1–2 weeks |
Mix into your normal watering — no separate feeding routine needed.
What's Inside
The 3-3.6-5.1 ratio is built around the reason bougainvillea underperform: too much nitrogen. Phosphorus at 3.6% and potassium at 5.1% both outweigh nitrogen at 3%, which shifts the plant's energy toward bract production rather than vine and leaf growth. All of the nitrogen is nitrate nitrogen, the form roots absorb directly, so response is fast and burn risk stays low in the lean, fast-draining soil bougainvillea prefer.
Beyond NPK: sea kelp (Ascophyllum nodosum) for natural growth compounds, plus calcium at 2.1% — unusually high, and what builds sturdy canes and holds bracts longer — magnesium (0.75%), iron, manganese, zinc, boron, and copper. Iron matters especially in alkaline soil and hard-water regions, where bougainvillea leaves yellow between the veins while the veins stay green.
Made For
Bougainvillea in every form: in-ground plants in warm zones, patio pots and hanging baskets, trellised vines and espaliers, bonsai specimens, and plants overwintered indoors — across all bract colors and named varieties.
Problems It Solves
- Vigorous green growth with few or no bracts
- Bracts that fade and drop quickly after opening
- Yellowing between the veins while veins stay green
- Sparse, weak canes that don't fill a trellis or basket
FAQs
How often should I feed my bougainvillea?
Every 1–2 weeks during spring and summer while the plant is actively growing and blooming, and every 2–4 weeks in fall and winter. Diluting into your regular watering (2 Tbs per gallon) keeps nutrition steady — bougainvillea respond better to consistent light feeding than occasional heavy doses.
My plant is all leaves and no flowers — will this help?
That's the most common bougainvillea complaint, and it usually traces to nitrogen-heavy fertilizer. This formula runs phosphorus and potassium above nitrogen to shift energy toward bracts. Pair it with full sun and slightly lean watering — bougainvillea bloom hardest when they aren't overwatered.
Should I keep feeding through winter?
Feed every 2–4 weeks through fall and winter to maintain the plant without pushing tender growth. Plants overwintered indoors or in cool climates slow down and may drop leaves — that's normal. Return to the spring and summer schedule when new growth resumes.
Will this burn my plant?
No — at the directed dilution, the formula is designed for regular use. All-nitrate nitrogen and low salt concentration make burn very unlikely, even in the lean, fast-draining soil bougainvillea prefer. For newly planted or recently repotted plants, start at half strength for the first two feedings.
Can I use it on potted and bonsai bougainvillea?
Yes, at the same dilution. Container plants actually benefit most, since potting mix runs out of nutrients faster than garden soil and bonsai specimens are root-pruned regularly. Use the watering can rate for pots and the hose end sprayer for in-ground plants and large trellises.
When will I see results?
New growth typically comes in greener within the first couple of weeks, and yellowing from iron shortfall corrects on new leaves. Bloom response follows the plant's own cycle — consistently fed plants set noticeably heavier bract flushes over the following season.
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