“Helen, do you really just use kitchen scraps on all your camellias?” I get this question at least twice a year, usually from someone who’s seen a photo of my garden and assumes my 200-plus plants must be thriving on nothing but coffee grounds and good intentions.
The honest answer is no. And I’m going to tell you why, because I think a lot of gardeners turn to homemade fertilizer for camellias hoping to skip the commercial stuff entirely—and that approach can backfire, especially if you’re growing prize specimens like my beloved ‘Elegans Supreme’ or the temperamental pink-and-white ‘Mathotiana Variegata’.
Homemade options absolutely have a place in my feeding routine. But after 20 years and more camellia mistakes than I care to admit, I’ve learned they work best as a supplement to a proper fertilizing schedule, not a replacement for it. Here’s what actually works—and what doesn’t.
Do Homemade Fertilizers Actually Work for Camellias?
Yes and no. Let me be specific because this matters for your plants.
Camellias are picky eaters. They need consistent nitrogen for leaf and stem growth, balanced phosphorus for root development, and adequate potassium for bud set and flower quality. They also prefer slightly acidic soil and benefit from trace elements like magnesium, iron, and manganese.
Most kitchen scraps and homemade mixes give you only part of that equation. Coffee grounds add modest nitrogen and mild acidity. Banana peels deliver potassium but break down slowly. Eggshells contribute calcium—which actually works against the acidic soil camellias want.
As a result, relying on homemade options alone often leads to imbalanced feeding. You might see decent flowers one year but weak new growth the next. Young plants and potted specimens—which have less soil reserve—suffer most.
That said, homemade fertilizer for camellias serves a real purpose. It’s economical, it encourages mindfulness about feeding schedules, and it can address specific deficiencies or boost your plant between scheduled commercial feedings. Just don’t expect it to replace a spring feed with a proper acid-loving-plant fertilizer.
The Best Homemade Options and How to Use Them
I’ve tested every home remedy I could find over two decades. These are the ones that actually deliver results without harming your camellias.
Coffee Grounds and Tea Leaves
Coffee grounds are the gateway homemade fertilizer—everyone has them, and they do genuinely acidify soil slightly while adding a small amount of nitrogen (about 1-2% by weight). But here’s where I nearly ruined a plant and learned a hard lesson.
Three years ago, I had a container-grown ‘Elegans Supreme’ that was struggling with interveinal yellowing. In my impatience, I piled fresh, wet coffee grounds heavily around the base thinking I’d “fix it fast.” Within weeks, the grounds had matted into a water-repellent crust. Water ran right off instead of soaking in, and the drainage problem got worse, not better.
The fix? I carefully aerated the mulch layer, removed the worst of the compacted grounds, and switched to a proper balanced fertilizer. The plant recovered, but it taught me a critical lesson: fresh coffee grounds can do more harm than good if applied carelessly.
Here’s my correct method now. I save coffee grounds and let them dry slightly. Then I work them into the top 2–3 inches of mulch around the plant’s base—not piled against the stem—just 2 or 3 times a year. Used tea leaves (loose or from bags) get the same treatment. The acidifying effect is mild but real, and when mixed into mulch rather than left on the surface, they break down without matting.
Think of them as a soil conditioner that happens to feed lightly, not as your main nitrogen source.
Banana Peels and Potassium
Banana peels are rich in potassium, which supports strong flowering and healthy root systems. In my experience, they’re genuinely useful for camellias, but only if you use them right.
Fresh banana peels left on the soil surface decompose slowly and attract pests. Worse, they look untidy in a garden you care about. Instead, I chop them into small pieces and bury them 3–4 inches deep near the drip line of established plants. The potassium leaches into the soil as they break down, and by the time the peel has fully decomposed, it’s out of sight.
For container plants, I prefer adding chopped peels to a compost pile or worm bin, then working that finished compost into the top layer of potting soil. For in-ground camellias, the buried-peel method works well as a post-bloom supplement—roughly May through June in my zone 8a garden, after the main spring fertilizer has done its work.
One peel per established plant, two or three times per season, is plenty. More than that, and you’re introducing inconsistent potassium spikes that don’t really help.
Epsom Salts for Magnesium Deficiency
Epsom salt (magnesium sulfate) is not a general-purpose fertilizer. It’s a targeted fix for one specific problem: magnesium deficiency, which shows up as interveinal yellowing on the plant’s older leaves while veins stay green.
If your camellia has that symptom, Epsom salts can help. Dissolve 1 tablespoon per gallon of water and use it as a soil drench or foliar spray once in late spring and once in mid-summer. That’s it—that’s the right dose.
I’ve seen gardeners apply Epsom salts every month, thinking more is always better. It isn’t. Excess magnesium can interfere with calcium uptake and create other imbalances. Use it only if you see the symptom, and only a couple of times per growing season.
Better yet, have your soil tested. True magnesium deficiency is less common than people think. Often that yellowing leaf is a sign of poor drainage or nitrogen imbalance, which Epsom salts won’t fix.
Compost Tea
This is the homemade fertilizer I genuinely recommend for ongoing use, because it actually works and it’s hard to mess up.
Compost tea is made by steeping finished, well-rotted compost in water for 3–5 days. The ratio I use is one part finished compost to five parts water, loosely packed into a bucket. Stir it every day or two. After several days, strain out the solids, and you have a mild, balanced liquid feed containing a gentle mix of macro and micronutrients.
The beauty of compost tea is that it’s dilute enough that you can apply it fortnightly without burning roots. It won’t replace your spring feed, but it’s excellent as a supplemental boost from late spring through early fall. I use it on container camellias especially, because potted plants benefit from frequent but gentle feeding.
Make a batch in a 5-gallon bucket and use it over a week or two. The flavor of your compost matters—if it’s rich and dark and smells earthy (not sour), your tea will be good. If the compost is poor quality or immature, so is the tea.
Is Tomato Feed Good for Camellias?
I get asked this question regularly, especially by UK gardeners familiar with Tomorite and similar tomato feeds. The short answer is: not as your main fertilizer.
Tomato feeds are formulated for fruiting vegetables, which need very high potassium (potash) to encourage flowering and fruit set. The typical N-P-K ratio is something like 4-8-10, meaning far more potassium than nitrogen.
Camellias need more balanced feeding. They require steady nitrogen for healthy foliage and robust new stem growth. A typical camellia or acid-loving-plant fertilizer runs closer to 5-4-4 or 6-4-4. If you rely solely on tomato feed, you’ll often end up with a plant that flowers okay but produces weak, sparse new growth. The plant looks tired.
That said, used as an occasional supplement—say, a diluted dose once or twice after blooms fade—tomato feed isn’t harmful. The extra potash can give flowering a small boost and won’t damage your camellia. Just don’t let it become your main feed.
In my own practice, I use a proper camellia or rhododendron fertilizer for the main spring feed, and I never substitute tomato feed for that step. If I’m looking for a potassium boost midseason, I’d choose banana peels or compost tea before reaching for tomato feed. It’s the wrong tool for the job, even if it does produce flowers.
What to Avoid
Just as important as what to use is what not to use. I’ve learned some of these lessons the hard way.
Wood ash raises soil pH, making soil more alkaline. Camellias want acidic conditions. Wood ash has no place in a camellia bed. Period. I made this mistake early in my gardening life and spent two seasons bringing the pH back down.
Fresh manure is tempting because it’s rich and readily available. But it can scorch roots, is often heavy with weed seeds, and tends to be too nitrogen-heavy and alkaline for camellias. If you must use manure, age it for at least a year first, and use it sparingly in fall as a soil amendment rather than a fertilizer.
Eggshells are alkaline, which directly contradicts what your camellia needs. Yes, they add calcium, but only use them if a soil test shows a genuine calcium deficiency—and honestly, that’s rare in camellia cultivation. Don’t treat them as routine fertilizer.
These three things seem harmless but will either acidify your soil away from what camellias want or introduce nutrients in forms and concentrations that don’t fit the plant’s needs.
Homemade Fertilizer for Camellias: Supplement, Not Replacement
After 20 years and over 200 cultivars in my care, here’s my honest recommendation: homemade fertilizer for camellias is a wonderful supplement to a structured feeding schedule, but it shouldn’t replace it.
Start with a proper spring feed—something formulated for acid-loving plants or camellias specifically. Follow up with a mid-season application if your plant is in a pot or showing signs of slowing growth. Between those scheduled feedings, use compost tea fortnightly, work coffee grounds and tea leaves into your mulch a few times, and bury banana peels near the drip line post-bloom.
If you see interveinal yellowing, reach for Epsom salts. Skip the tomato feed entirely unless you have it on hand and want to use it as an occasional post-bloom treat, heavily diluted.
The camellias that shine in my garden—plants like ‘Mathotiana Variegata,’ ‘Pink Perfection,’ and ‘Nuccio’s Gem’—aren’t thriving on kitchen scraps alone. They’re thriving because I feed them consistently with the right balance of nutrients, and I use homemade options thoughtfully, in between.
That’s the real secret. Not kitchen-scrap magic, but intention and balance.
