What is the best fertilizer for a Monstera?

How we researched this

We read 15 Reddit threads in full (509 comments) across r/Monstera and r/plantclinic, tallied every fertilizer recommendation and complaint, and verified prices and NPK numbers on retailer pages. We did not run growth trials; this page reports what Monstera owners actually use, with links to the discussions.

What Monstera owners recommend

Pick	Product	Mentions	NPK	Price
Best overall	Dyna-Gro Foliage Pro	~11 recommenders in 7 threads	9-3-6	$18.99/qt
Best organic	Fish emulsion (Alaska, Neptune's Harvest)	~10 in 5 threads	5-1-1 / 2-3-1	~$12/qt
Safest for beginners	Worm castings	~6 in 4 threads	~1-0-0	from $7.99
Best budget	Miracle-Gro Indoor liquid	~5 in 4 threads	1-1-1	~$5-10
Strongest growth push	Fox Farm Grow Big	~3 in 3 threads	6-4-4	$21.99/pt

Dyna-Gro Foliage Pro, the enthusiast standard

The most named product by a clear margin (amazon.com/dp/B00816TIOE). Owners credit it with bigger leaves, faster, and it is the default answer for plants in LECA or water because it carries calcium and magnesium that most liquid feeds skip. Its 9-3-6 formula is the 3-1-2 ratio foliage plants want. Note: Dyna-Gro products now ship under the Superthrive brand name, which confuses shoppers; it is the same formula.

Fish emulsion, the organic favorite with one famous flaw

Alaska 5-1-1 (about $12 a quart) and Neptune's Harvest fish and seaweed (amazon.com/dp/B000OWBUSA) drew the most enthusiastic growth reports of anything: "plants go crazy." Organic, gentle, nearly impossible to burn with. The complaint is unanimous: it stinks for a while after feeding. The crowd workaround is feeding at night.

Worm castings, the cannot-fail option

Top-dress a few handfuls or mix into the soil at repot. No smell, and owners repeat the same line: you cannot burn roots with castings even if you overdo it. Mild and slow, so heavy growers pair castings with a liquid feed.

One product to avoid

Liqui-Dirt came up in three threads, and not favorably. The sharpest critique, from a plant physiology student: its nutrient values are so low it legally cannot be labeled a fertilizer. If you see it in an influencer video, check the NPK on the bottle.

How to not burn your plant

Dilute below label strength (half is the community norm, quarter for every-watering feeding), feed only during active growth, and flush the pot with plain water every couple of months to clear salt buildup. Brown tips plus white crust on the soil means stop feeding and flush.

Frequently asked questions

How often should I fertilize my Monstera?

It depends on the product. Dyna-Gro Foliage Pro is designed for a weak dose at every watering, about a quarter teaspoon per gallon. Fish emulsion is a monthly feed. Slow-release pellets like Osmocote Plus go in once and feed for months. Whichever you pick, feed during active growth and cut back sharply in winter.

What NPK ratio is best for a Monstera?

A roughly 3-1-2 ratio suits foliage plants like Monstera, which is exactly what Dyna-Gro Foliage Pro's 9-3-6 formula is. Monstera grow leaves, not flowers or fruit, so they want nitrogen ahead of phosphorus. Balanced formulas like 20-20-20 also work at reduced strength; avoid bloom boosters.

Can fertilizer burn my Monstera?

Yes, and over-fertilizing looks like brown leaf tips and edges, crispy patches, and white crust on the soil. The community's standard prevention is to dilute liquid fertilizer to half or quarter of the label strength. Worm castings are the one option owners call impossible to overdo, which makes them the safest choice for beginners.

Is fish emulsion good for Monstera?

Very good, and it is the community's favorite organic option. Owners report dramatic growth on Alaska 5-1-1 and Neptune's Harvest fish and seaweed. The one universal complaint is the smell after feeding. It fades within a day, and several owners solve it by fertilizing in the evening.

Does a Monstera in LECA or water need a different fertilizer?

It needs a complete hydroponic-friendly feed, and this is where Dyna-Gro Foliage Pro shines: it contains all essential nutrients including calcium and magnesium, which many soil fertilizers skip because soil normally supplies them. In LECA or water there is no soil to fill the gap, so a complete formula is not optional.

Is aquarium water good for a Monstera?

It is a real, free, mild fertilizer, and several Monstera owners swear by it. Water from a freshwater tank change carries nitrogen compounds and trace nutrients at gentle concentrations. It will not replace a complete feed for maximum growth, but as a supplement it is the cheapest option there is.