Field Notes · Fundamentals
Plant care basics
The five levers behind every healthy plant — light, water, media, humidity, and food — and how to read what your plant is telling you.
Light
Light is food. More plants starve politely in dim corners than die of any pest. Learn three terms and you can place almost anything.
- Direct sun
- Sunbeams physically touch the leaves for hours. For most cacti, many succulents, citrus, Sarracenia, and sun-hardened Nepenthes. Introduce gradually — even sun-lovers burn after a dark spell.
- Bright indirect
- Bright enough to cast a soft shadow, but the beam misses the plant — near an east window or set back from a south/west one. The sweet spot for aroids, orchids, most tropicals, and most Nepenthes.
- Grow lights
- A full-spectrum LED 20–40 cm above the canopy for 12–14 h beats any dark room. If new leaves come in smaller and paler with long gaps on the stem, the plant is asking for more light.
Water — how, when, and which water
Watering kills more plants than drought, and it's almost never about the calendar. Water by weight and feel, not by schedule.
Lift the pot (light = dry) or push a finger two knuckles into the mix. Water when the top few cm are dry for tropicals; when fully dry for succulents/cacti; never let carnivores dry out.
Water thoroughly until it runs from the drainage holes, then let it drain — sips create dry pockets and salt buildup. No drainage hole, no deal.
Tap is fine for most tropicals (let chlorine off-gas overnight if yours is heavy). Carnivorous plants are the exception: rain, RO, or distilled only — dissolved minerals accumulate in their poor-soil roots and kill them. Calathea, some ferns, and orchids also prefer low-mineral water.
Sarracenia, Dionaea, and many Drosera like sitting in 1–3 cm of pure water through the growing season. Almost everything else hates wet feet.
Media & potting
"Soil" is a delivery system for air and moisture. Match the mix to the roots, and repot when the plant, not the calendar, says so.
- Tropicals & aroids
- Chunky and airy: potting mix cut with perlite and bark. Roots want to breathe between waterings.
- Succulents & cacti
- Gritty and fast-draining: at least half mineral (pumice, perlite, coarse sand). If it holds a wet clump in your fist, add more grit.
- Orchids
- Bark chunks or sphagnum in a breathable pot — epiphyte roots need light and air, not soil.
- Carnivorous plants
- Nutrient-poor only: sphagnum/peat with perlite or silica sand. Never regular potting soil, never anything with added fertilizer — it burns their roots.
- When to repot
- Roots circling the pot or poking from drainage holes, water rushing straight through, or the mix staying soggy for a week. Go up one pot size only, and expect a short sulk after.
Humidity & airflow
Humidity is comfort, airflow is health — you want both, not one.
Fine for succulents, cacti, ficus, most easy tropicals, hardy Nepenthes hybrids.
Where calathea stop crisping and highland Nepenthes, Heliamphora, and filmy ferns actually thrive. A clear tub or grow tent is the honest way to get there — misting is decoration.
A small fan on low, even inside tents. Still humid air is a fungus and mite factory; moving humid air is a cloud forest.
Feeding
Fertilizer is a multiplier, not a medicine — it helps a healthy plant grow and hurts a struggling one.
- Tropicals, aroids, citrus
- Balanced liquid feed at ¼–½ the label strength, every 2–4 waterings during active growth. Skip it in deep winter or right after repotting.
- Succulents & orchids
- Even weaker, less often — "weakly, weekly" for orchids in growth; a few times a season for succulents.
- Carnivorous plants
- They feed themselves — that's the whole trick. Never fertilize the media. Indoors with no insects, an occasional dried bloodworm or dilute foliar orchid feed into the traps is plenty.
- Salt reset
- Every month or two, water heavily to flush accumulated salts through the drainage holes — crispy leaf edges are often salt, not drought.
Dormancy & seasons
Some plants are supposed to look dead for a while. Fighting a natural rest kills more temperate plants than winter itself.
Need a cool 2–4 month winter rest — growth stops, traps brown, the rhizome sleeps. Keep barely moist and cold, and they come roaring back in spring.
A dry, cool, bright winter rest sets up the spring flower show. Water a fraction of the summer amount.
No true dormancy, but growth slows with light — ease off water and feed in the dark months rather than pushing them.
Highland Nepenthes and Heliamphora don't want a winter — they want that day/night temperature drop every single night, all year.
Reading your plant
Plants report problems through their leaves. The usual translations:
- Yellowing lower leaves
- Usually overwatering or hunger; one old leaf at a time is just normal aging.
- Crispy brown edges
- Dry air, salty water, or missed waterings — calathea's signature complaint.
- Leggy, pale, stretched
- Not enough light. Move it brighter or add a lamp; the stretch never reverses, but new growth compacts.
- Wilting in wet soil
- Root rot — the roots drowned and can't drink. Unpot and rescue, don't water harder.
- No pitchers on a Nepenthes
- Humidity or light, almost always — pitchering is the first luxury cut when conditions dip.
- Speckles, stickiness, webbing, fluff
- That's not culture — that's company. Go to the pest guide.