Need more context?
Build a better houseplant mix
For particle size, water retention, texture and dry-down speed.
Fine-tune a chunky aroid mix
For Monstera, Philodendron, Anthurium, Syngonium and other chunky-mix growers.
Understand semi-hydro before switching
For inert substrates, reservoirs, nutrients and what changes when soil is removed.
More ingredients do not automatically make a better potting mix. Pot size, root size, warmth, light level, watering volume, airflow, humidity and pot material all change how a mix behaves.
Choose the smallest change that solves the problem first. Add what the mix actually needs, not everything at once. If a plant is already sitting in an oversized pot, cold conditions, old collapsed substrate or a pot without drainage, substrate ingredients alone will not fix the root-zone problem.
Most substrate ingredients adjust structure, moisture behaviour, weight or airflow. They are not complete plant nutrition. Fertilising still depends on plant type, substrate type, watering routine and whether the plant is growing in soil, a mineral mix or semi-hydro.
Not sure what to add to houseplant soil or potting mix? Start with what the mix is doing: staying wet too long, drying too fast, feeling dense, losing structure, or needing a better base for aroids, Hoya, succulents, cuttings or terrariums.
Choose substrate ingredients or base mixes when you only need to adjust one part of a mix. Choose a Substrate Set when you want separate components selected for one clear job, such as opening dense soil, building a chunkier aroid mix, rooting cuttings or preparing a closed terrarium base.
Use this section to choose the right starting point. Pick an individual ingredient or base mix when you know the exact adjustment your mix needs. Pick a Substrate Set when you want selected components for one use case without choosing every material from scratch.
Choose single ingredients when…
Choose a Substrate Set when…
Pick the closest situation. Each card shows single ingredients to consider and the clearest Substrate Set match. Use the ratio guidance in the Substrate Sets section when you are ready to mix.
Issue
Heavy or compacted mixes can keep roots wet for too long, especially in oversized pots, plastic pots, cooler conditions or lower airflow.
Airflow & Drainage Substrate Set
Vermiculite, packed sphagnum moss and large amounts of coco coir, because they can keep an already-wet mix wet for longer.
Issue
Fast-drying mixes may need more moisture retention, but moisture-holding ingredients can quickly swing too far if the pot is large, cool or made from plastic.
None by default. Check the ingredient cards first, then add moisture-retentive material gradually.
Moisture-heavy combinations depend too much on plant type, root size, pot size, airflow and watering habits to be useful as one default set.
Issue
Flat, compacted mixes need more open structure so water and air can move through the root zone more easily. If the substrate has broken down badly, a full repot is usually better than adding ingredients on top.
Airflow & Drainage Substrate Set
Aroid Substrate Set
Hoya Substrate Set
Plant type
Aroids such as Monstera, Philodendron, Epipremnum, Syngonium and many Anthurium often need a mix with moisture, chunky structure and open space around roots.
Aroid Substrate Set
Aroid Substrate Set is soil-free and arrives as separate components, so you can adjust chunkiness and moisture retention by plant size.
Plant type
Many Hoya plants suit a leaner, bark-led mix with fast dry-down and strong structure around roots.
Hoya Substrate Set
An airy, structured mix that does not stay wet for too long after watering.
Plant type
Calathea/Goeppertia, Maranta, Ctenanthe and Stromanthe need steady moisture without a heavy, airless root zone.
Prayer Plant Substrate Set
Even moisture with enough airflow, not constantly wet soil.
Plant type
Many common succulents need a faster-drying, more mineral-leaning base than standard indoor potting soil. Very arid species, cactus-heavy pots, Lithops and split rocks may need an even leaner mineral mix.
Succulent Substrate Set
Purpose
Cuttings, plugs, seedlings and young roots need close contact, gentle moisture and enough air to avoid soggy collapse.
Propagation Substrate Set
Fine young roots usually need a clean, evenly moist, airy medium rather than a very chunky adult plant mix.
Purpose
Closed terrariums and planted glass need a base that handles enclosed moisture, layering and small tropical plants.
Terrarium Base Substrate Set
Cactus terrariums, succulent terrariums or open arid terrariums.
Purpose
Universal Soil can be opened up with ingredients that add structure, texture and mineral stability. It is useful when you want a familiar soil-based starting point rather than a specialist mix.
Universal Substrate Set
Universal does not mean suitable for every plant or every setup.
Use this section when you want to adjust one part of your mix: open texture, moisture retention, weight, structure or drying speed. Single ingredients change one behaviour at a time, while soil bases and ready mixes give you a starting medium to build from.
Perlite is a light mineral aggregate for loosening dense mixes and speeding dry-down.
Coco coir is a peat-free material that holds moisture and works well as a soft base in custom houseplant mixes.
Pine bark adds chunky organic structure, open texture and air pockets to tropical plant mixes.
Lava Rock Granules add porous mineral structure, weight and stability without making a mix moisture-heavy.
Vermiculite is a moisture-retentive mineral flake for young roots, seedlings and fine-rooted plants.
Sphagnum moss is a high-moisture material for terrariums, moss support and node rooting.
Activated carbon is a porous carbon ingredient for damp enclosed systems, especially closed terrariums.
Expanded clay is an inert clay medium for reservoir systems, semi-hydro setups and terrarium base layers.
Seedling & Cutting Soil is a fine base for young roots, cuttings and terrarium planting layers.
Universal Soil is an everyday potting soil for simple soil-based houseplant mixes. Use it when you want a familiar ready soil base that can be made lighter or chunkier with mineral and structural ingredients.
Important: Universal Soil is a useful base, not a one-size-fits-all solution for every plant or every setup.
Live moss is a living surface material for humid terrarium displays, not a general potting mix ingredient.
Base Soil Mix is a simpler blending base for custom substrate recipes. Choose it when you want to build your own mix from a soil base instead of starting with a more general ready potting soil.
Substrate Sets arrive as separate components selected for one clear job: opening dense soil, building a chunkier aroid mix, preparing a Hoya mix, supporting fine roots, rooting cuttings or building a closed terrarium base. Mix or layer the components yourself according to the plant, pot and conditions.
Ratio note: all ratios are starting points, not fixed recipes. Higher humidity, cooler rooms, plastic pots, oversized pots and low airflow slow drying. Terracotta, warmth, stronger airflow and smaller pot volumes usually speed it up. Adjust the mix by how the pot actually dries, not by the recipe alone.
Fertiliser note: most substrate components change structure, water behaviour or airflow. They are not complete plant nutrition. Fertilising still depends on plant type, substrate type, watering routine and whether the plant is growing in soil, a mineral mix or semi-hydro.
Fix an existing mix
For opening dense soil with perlite, pine bark and Lava Rock Granules. Use it when an existing potting mix stays wet too long, feels flat, or needs more open structure around roots.
Adjustable soil base
For making Universal Soil lighter, looser and easier to adjust for common soil-based indoor plants. Use it when you want a familiar potting soil base with more structure and better dry-down.
Plant group
Soil-free set for chunky aroid blends with moisture, structure and open space around roots. Use it for many Monstera, Philodendron, Epipremnum, Syngonium and Anthurium grown in a chunky mix.
Plant group
Bark-led set for Hoya plants that prefer an airy, fast-draining root zone. Use it when you want strong structure and faster dry-down without turning the potting mix moisture-heavy.
Fine-root plants
Fine-root set for Calathea/Goeppertia, Maranta, Ctenanthe and Stromanthe that need steady moisture without a heavy, airless pot. The goal is even moisture with enough structure for oxygen around roots.
Plant group
Mineral-leaning set for many common succulents that need a faster-drying base than standard indoor potting soil. Use it for soil-based succulent mixes that need more mineral structure and less moisture hold.
Young plants
For cuttings, plugs, seedlings and young roots that need close contact, gentle moisture and enough air. Use it when the root system is still small and a chunky adult mix would dry unevenly around roots.
Closed terrariums
Layering set for closed terrariums and humid planted glass. It gives you separate base components for drainage, carbon layer and planting layer.
SUBSTRATE FAQ
Clear answers before you choose, mix or adjust a houseplant substrate.
Substrate Sets, ingredients & potting mixes
A substrate ingredient is one material used to change how a mix behaves, such as perlite, coco coir, pine bark, lava rock or vermiculite. A Substrate Set contains separate components selected for one use case, such as aroids, Hoya, succulents, propagation or closed terrariums. A potting mix is a ready-made or pre-blended growing medium.
No. Substrate Sets arrive as separate components. You mix or layer them yourself depending on plant type, root size, pot size and growing conditions.
Use the components straight from their own bags, but do not treat the whole set as one finished substrate. For most sets, you mix the separate materials in the suggested starting ratio and then adjust by pot size, root size and drying speed. For Terrarium Base Substrate Set, layer the components instead of blending everything together.
Choose single ingredients if you already know the exact adjustment your mix needs. For example, perlite or lava rock can help open a dense mix, while vermiculite can add moisture retention when used carefully. Choose a Substrate Set if you want selected components for a clear use case without choosing every material from scratch.
No. Ratios are starting points. The same mix dries differently in plastic, terracotta, high humidity, dry air, cooler rooms, warmer rooms, strong airflow or low airflow. Start with suggested ratios, then adjust by how quickly the pot actually dries.
Drainage ingredients help, but they cannot fix everything. Potting mix can still stay wet if the pot is too large, drainage holes are poor, conditions are cool, airflow is low, roots are small, or old substrate has collapsed. If roots are already rotting, repotting and root cleanup matter more than simply adding another ingredient.
No. Most substrate ingredients change structure, moisture behaviour, weight or airflow. They are not complete plant nutrition. This matters especially in mineral or semi-hydro setups, where fertiliser has to supply nutrients because the substrate itself does not feed plant roots.
Universal Soil is an everyday potting soil base for simple soil-based houseplant mixes. Base Soil Mix is a simpler blending base for building custom substrate recipes. Choose Universal Soil when you want a familiar soil-based starting point. Choose Base Soil Mix when you want more control over added structure, drainage and moisture retention.
Airflow & Drainage Substrate Set is the clearest match for dense, slow-drying soil. It helps add structure with perlite, pine bark and Lava Rock Granules. Check pot size and drainage first, because a better mix cannot fully compensate for an oversized pot, poor drainage or constantly cold, wet conditions.
Use it as a starting point, not as one fixed recipe for every plant. Monstera, Philodendron, Epipremnum, Syngonium and many Anthurium often benefit from a mix with chunky structure, moisture and air around roots. Smaller plants, fine roots and stressed plants may need a slightly finer or more moisture-balanced version.
No. Hoya Substrate Set is more bark-led and fast-draining, with pine bark, perlite and Lava Rock Granules. Aroid Substrate Set also includes coco coir, so it has a different moisture and structure balance for chunky tropical aroid blends.
No single mix is right for every succulent or cactus. Succulent Substrate Set is a good starting point for many common succulents because it leans more mineral and dries faster than standard potting soil. Very arid species, cactus-heavy pots, Lithops and split rocks may need an even leaner mineral mix.
Propagation Substrate Set is the best match. Young roots usually need close contact, gentle moisture and enough air, not a very chunky adult plant mix. Use less moisture-retentive material if the setup already stays humid or slow-drying.
No. Terrarium Base Substrate Set is for closed terrariums and humid planted glass with small tropical plants. It works as a layering system, not as a normal potting mix recipe. It is not the right set for cactus, succulent or open arid terrariums.
SUBSTRATE GUIDES
Use these guides for more detail on potting mix structure, root health, plant-group needs, drainage, aeration and semi-hydro growing.
Substrates are the hidden factor behind strong roots and predictable indoor growth. This guide breaks down organic vs. inorganic components, compares drainage and moisture traits, and shares DIY recipes plus plant-specific mixes for popular houseplants.
Tired of roots rotting in waterlogged LECA or a Pon mix that dries too fast? This guide breaks down how inert substrates really behave — wicking height, airflow, nutrient buffering, pH drift, durability — and shows how to build blends and pot setups that stay stable long-term.
Most aroids don’t fail from bad light — they fail in the wrong mix. This guide shows how to build root-first substrates for Anthurium, Philodendron, Monstera, Alocasia and other aroids by matching their growth habits and root types to the right structure, moisture retention, and aeration, with practical templates, semi-hydro notes and troubleshooting for compacted or failing mixes.
Most houseplants don’t rot because you “overwatered” once — they rot because their potting mix can’t breathe. This guide breaks down the real physics behind drainage vs aeration, perched water tables, and air-filled porosity, then shows you how to choose ingredients, mixes, and pots that keep roots oxygenated, stable, and growing for the long term.
Many top houseplants are epiphytes or hemiepiphytes, built for air, mist, and debris—not peat-heavy soil. This guide explains epiphyte types, canopy adaptations, and the indoor setup: airy substrates, soak-dry cycles, light, airflow, and climbing support.
Semi-hydroponics replaces soil with inert mineral substrates and a reservoir-based watering system. This guide covers choosing LECA vs Pon mixes, transitioning plants safely, feeding and flushing, and diagnosing common problems like root rot, yellowing, and droop.
Sign up for Foliage Factory newsletter for early access to new arrivals and practical care tips that work in real homes.
