9 Step Chilli Seed Sowing Routine with Apache Plants Under a Garland Heated Mat

Step 1: Sow Apache seed at 5mm into a moist medium

Apache is an F1 compact chilli that fruits at around 6cm, and its seed germinates fastest when held at 25C to 28C. Fill 9cm pots or a seed tray with a low-nutrient seed compost, firm it lightly, and water before sowing so the surface is already damp. Press each seed 5mm below the surface, cover, and label with the sowing date. A single packet usually holds 8 to 10 seeds, so two pots with four seeds each gives a working margin against the failures that always occur.

Moisture at this depth matters more than most beginners expect. Seed that dries out during the 7 to 14 day germination window simply stalls, and Apache will not always restart once it has dried. Bottom watering, standing the pot in 2cm of water for ten minutes until the surface darkens, avoids dislodging the seed and reduces the surface crusting that traps emerging cotyledons. The compost should feel like a wrung-out cloth, never waterlogged, because saturated medium at 27C is the exact condition that breeds the damping-off fungus that flattens a tray overnight.

Step 2: Set the Garland mat and check the real temperature

A Garland Standard Propagation Mat draws around 18W and warms the rooting zone, not the air, to roughly 10C above ambient. In a 15C room that lands you near 25C at the compost surface, the lower edge of the Apache germination band. The unheated Garland mats run open-loop, meaning they have no thermostat and hold a fixed offset; the thermostatically controlled versions let you dial a setpoint and are worth the extra outlay if your room swings more than a few degrees overnight.

Do not trust the offset on faith. Push a soil thermometer probe into a spare pot of the same compost sitting on the mat, leave it an hour, and read the actual figure. A mat on a cold tiled floor loses heat downward and can sit 4C below its rated offset, which drops Apache straight out of its band and stretches germination past three weeks. A 2cm sheet of polystyrene under the mat closes most of that loss. Cover the tray with a propagator lid or clear bag to trap humidity, and prop one corner open by 1cm so condensation can escape rather than dripping back onto the seed.

Step 3: Move seedlings off the heat the day they emerge

The most common Apache failure is leaving seedlings on the mat after the cotyledons open. Continued bottom heat with low light produces a pale, stretched stem that topples within days. The moment green breaks the surface, lift the tray off the Garland mat and move it to the brightest windowsill or under a grow light held 5cm above the leaves.

Step 4: Light, water, and the damping-off threshold

Apache seedlings need 14 to 16 hours of bright light a day to stay compact. A south-facing windowsill in late winter delivers nowhere near that, which is why the stems lean and elongate. A single 20W LED grow bar on a timer holds the seedlings stocky and squat. Raise the bar as the plants grow so it stays 5cm above the canopy; closer than that scorches the cotyledons, and further than 15cm undoes the benefit.

Water from below and let the surface dry between drinks. The fungus behind damping-off, Pythium and its relatives, colonises a constantly wet surface and rots the stem at soil level, where a brown pinched collar appears before the seedling falls flat. A 4cm fan running on low for an hour twice a day moves air across the tray and keeps that surface film from forming. If one seedling collapses, remove it and its immediate compost at once, because the fungus spreads outward through wet medium faster than you can rescue neighbours.

Step 5: Pot on at the first true leaves

When the first pair of true leaves has fully opened, distinct from the rounder cotyledons, the seedling is ready for a 7cm or 9cm pot of multipurpose compost. Hold the plant by a leaf, never the stem, because a crushed stem at this stage is fatal and a torn leaf is not. Bury Apache slightly deeper than it sat before, up to the cotyledons, since chilli stems readily root from the buried section and the deeper anchor steadies a top-heavy plant.

This is also the point to start a dilute feed. A quarter-strength tomato feed, something like Tomorite at 2.5ml per litre instead of the labelled 10ml, every second watering supplies enough nitrogen for leaf growth without the soft sappy stems that aphids target. Keep the potted-on plants warm, around 18C to 21C, but they no longer need the Garland mat unless your room drops below 15C at night. A windowsill propagator with the lid off during the day and on at night bridges the gap in an unheated room.

Step 6: Harden off through a cold frame before any move outdoors

Chilli grown indoors has thin cuticles and no wind conditioning, so a direct move outside scorches the leaves and checks growth for a fortnight. The cold frame hardening off cycle solves this over 7 to 10 days. Start when night temperatures hold reliably above 10C, which in most temperate gardens means a fortnight after the last expected frost.

Open the cold frame lid a hand-span on the first day for a few daytime hours, then close it before evening. Widen the opening each day, leave it fully open by day five, and on the final two nights leave it open overnight if no frost is forecast. The plants thicken their stems and their leaves develop the waxy surface that resists both sun and wind. A frame with a soil thermometer inside removes the guesswork; if the internal night low dips under 8C, close the lid and add a day to the schedule. Apache is hardier than a sweet pepper but will still sulk and drop flowers after a cold shock.

Step 7: Mulch the final container or bed

Apache crops well in a 5 litre pot or in open ground, and a 3cm mulch layer over the compost surface holds moisture and steadies root temperature through summer swings. Leaf mould, the slow product of a two-year leaf mould composting cycle, works as both mulch and structure once it has broken down to a dark crumb. Bagged leaves left to rot in a wire bin or perforated sack decompose by fungal action over 18 to 24 months, and the finished material holds many times its weight in water.

A mulch also suppresses the surface algae and liverwort that colonise constantly damp container compost in a humid greenhouse. Keep the mulch 2cm clear of the stem itself, because a collar of wet organic matter held against the chilli stem invites the same rot you fought off at the seedling stage. Top the layer up midsummer as it thins, and at the end of the season the spent mulch goes back onto the leaf mould heap to continue breaking down.

Step 8: Why the cordon training method does not suit Apache

The cordon training method, training a single stem up a string and removing side shoots, is built for indeterminate tomatoes and tall cordon chillies that keep extending one leader. Apache is a compact bush variety that branches low and fruits across the whole plant, so removing its side shoots strips out the very growth that carries the crop. A short cane and a single tie to stop the fruit-laden plant toppling is all the support it needs.

Step 9: Read the plant, not the calendar

Apache typically sets its first fruit 9 to 11 weeks after potting on, and the green pods ripen to red over a further 3 to 5 weeks. Picking the first few pods green pushes the plant to set more, while leaving everything to ripen on the bush slows new flowering. A plant that drops flowers without setting is usually too hot, above 32C in a closed greenhouse, or short of water at the root; shade and a deep evening soak both help.

Keep notes against the sowing date you wrote on the label in step one. The interval from sowing to first ripe fruit is the figure that lets you plan next season backwards from when you want the crop. A grower aiming for ripe Apache by mid-July, working back through a 3 week ripening window, an 11 week growth phase, and a fortnight of germination and potting on, lands on a sowing date in the second half of February. What that calculation cannot tell you in advance is how your own windowsill light levels will stretch the growth phase, which is the variable a single season of notes finally pins down.