Find the best spider plant fertilizers that will boost growth and help your plant produce more spiderettes in no time.
Spider plants stay forgiving even when conditions aren’t perfect. But a targeted feeding routine can noticeably shift their pace of growth and leaf quality. These plants respond best to a mild, balanced fertilizer in the 10-10-10 or 20-20-20 range, as long as you dilute it to half strength to avoid salt buildup. But there are plenty more options you can choose from!
Best Spider Plant Fertilizers
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General rule: Feed your spider plants every 2-3 weeks in spring and summer, reduce to once a month in fall, and stop completely during winter, when growth naturally slows. Unless the frequency specified for a fertilizer recipe is more or less!
1. Balanced Liquid Houseplant Fertilizer
Nothing works quite like a classic balanced formula (NPK 10-10-10 or 20-20-20). It’s a reliable, all-purpose feed for spider plants that supports leaf development and stable roots.
Since spider plants prefer lighter nutrition than many houseplants, diluting this fertilizer to half or one quarter strength is key to avoid salt buildup around their sensitive roots. Simple, right?
Pro Tip: Every 6–8 weeks, flushing the soil with plain water helps prevent the brown leaf tips that often appear when salts accumulate. Switching brands periodically is also helpful because each formula carries a slightly different micronutrient profile.
You can choose a long-spout watering can to make flushing of the soil much easier. Check out the best buy option here.
2. Worm Castings Tea
If your spider plant needs a nutrition boost without any risk of burning, worm castings are the gold standard natural fertilizer. A simple tea made by soaking two handfuls of castings in water for a day provides an easy, root-safe liquid feed.
Just give your spider plant about one fourth of a cup of dry castings or half a cup of tea every 3–4 weeks to keep the soil lively. You can also add a thin top layer before you travel to help maintain moisture balance while you’re away.
Many growers notice spiderettes maturing better when castings are part of the routine, largely due to improved root vigor.
High-quality organic worm castings are the best buy for this, and you will definitely see a noticeable difference in soil and root growth.
3. Seaweed Extract
Seaweed fertilizer works like a natural growth tonic for spider plants. The extract is rich in growth hormones like cytokinins, which will encourage new shoots and stimulate your spider plants to produce more pups.
It works best in a heavily diluted form (roughly one-fourth of the recommended dose) and can be applied to the soil or lightly misted onto the leaves for quicker absorption.
Just use it every 3 weeks or so during the growing season to support consistent baby spider plant formation. You can also apply it as a soil drench or foliar mist for extra-fast absorption.
4. Slow-Release Granules
If you prefer a low-maintenance fertilizer routine, slow-release granules are your best friend. Like the name suggests, they release nutrients gradually with each watering, keeping your spider plant well-fed without any guesswork.
You just have to sprinkle the granules onto the soil and mix lightly into the top layer, and that’s it. Just 1-2 teaspoons every 3–4 months is perfect, as a slow and steady nutrient drip keeps spider plants growing consistently without sudden nutrient spikes.
Pro Tip: Choose a formula with added micronutrients, such as iron and magnesium, to prevent pale, washed-out leaves.
5. Compost And Perlite Blend
This one isn’t one of the common spider plant fertilizers you’ll come across. That’s because it’s a trick to improve the soil structure in ways spider plants thrive on.
See, spider plants grow noticeably fuller when their soil remains airy, and blending a few handfuls of compost and perlite into the potting mix during repotting gives them an ideal environment to anchor in.
Even for established plants, working 1–2 cups into the top layer of a medium pot every 6 months helps refresh compacted soil.
You can get premium perlite and compost from here to create a much healthier potting mix for your spider plants.
6. Alfalfa Meal Tea
Alfalfa meal is another surprisingly effective supplement for spider plants because it contains triacontanol (a natural growth stimulant). And when a small amount of alfalfa meal is brewed into a mild tea, it provides gentle organic nitrogen and trace minerals that support consistent pup production without overwhelming the roots.
Use this every 4–6 weeks during the growing season. You’ll notice that plants treated with alfalfa tea develop fuller crowns and recover more quickly from minor stress.
You can buy your own organic alfalfa meal from here. It is suitable for many applications and is a great choice to proceed with.
7. Fermented Plant Extract (FPJ)
Fermented plant extract, often used in Korean natural farming, is a niche supplement that gives spider plants a gentle metabolic lift. It’s created by fermenting green plant material (such as comfrey or young shoots) with brown sugar, which pulls out minerals, enzymes, and beneficial compounds.
When diluted heavily, just a bit (0.5 to 1 teaspoon per gallon of water) mixed into the regular watering routine can help spider plants push out fresher, tighter foliage and bounce back faster after pruning or minor stress.
8. Epsom Salt Solution
Spider plants develop pale or dull foliage when magnesium is low, and a mild Epsom salt solution can fix this faster than most fertilizers.
Just dissolve 1 tablespoon of Epsom salt in 1 gallon (4 liters) of water and apply as a soil drench every 4–8 weeks during the growing season. Avoid overfeeding, as spider plants prefer gentle feeding and can develop leaf-tip burn if the solution is too strong.
Why It Works: Magnesium boosts photosynthesis and pigment formation, and the sulfur content in it helps enzyme activity. Together, they keep your spider plant greener and healthier.
Choose to purchase your own garden-grade Epsom salt from here that works well for houseplants and lasts really long.
9. Fish Emulsion
Fish emulsion may not smell pretty, but spider plants adore what it does for their leaves. This nitrogen-rich formula will help your spider plant produce deeper green foliage with faster shoot development. Since it is organic, it is very gentle on the roots.
You need to mix the emulsion into water at a very weak strength (one-fourth strength of the labeled amount), as spider plants don’t need it too concentrated.
Adding it to your watering routine once every 3-4 weeks keeps chlorophyll production humming, which makes a clear difference in leaf sheen.
Here’s a tip: Many plant owners also notice that after a mild episode of underwatering, fish emulsion helps the plant bounce back more quickly.
10. Bone Meal, But Sparingly
Bone meal can support spider plants, but only give it in very small amounts, as spider plants do not like phosphorus-heavy fertilizers. If you give it to the plant every once in a while, the phosphorus will strengthen the roots and support healthier pup development.
Mix just half a teaspoon into the soil during repotting or sprinkle a pinch on top once per year. Remember that overuse can cause nutrient imbalance and raise soil pH too much for spider plants’ comfort. Check out our guide for all the details!
Caution: Never use bone meal for tiny or newly rooted spider plant pups; they grow better with light liquid fertilizers instead.
Here’s an excellent buy option for a bone meal fertilizer for your plant.
With the right fertilizer, your spider plant will stay healthy, full, and endlessly productive. Try one or two of these options and watch your plant respond with greener leaves and plenty of new babies.
