How to Feed Autoflowers: Nutrients, Timing and Autos vs. Photoperiods

When should you start feeding an autoflower?

Start feeding an autoflower around the second or third week after germination, with a light dose that you build up gradually. Autoflowers live short lives and flip to flower on their own, so they have no time to recover from a heavy hand: go easy early and increase slowly.

As a rule of thumb, nutrients come in once the seedlings are a few weeks old, usually somewhere between week two and week three after they sprout. For those first feeds, stick with cannabis-specific fertilizers or organic nutrients made for growing weed, since they deliver what the plant needs in the right proportions for healthy development.

Follow the manufacturer's directions and don't overdo it. Too much fertilizer can cause nutrient lockout (when salt buildup or a pH swing keeps the roots from absorbing what's already there) or straight-up damage the plant. Watch your plants closely and keep an eye out for signs of deficiency or excess so you can adjust the feeding as you go.

Your growing medium and container size also change how much food the plant needs. Keeping nutrients balanced is the whole game if you want healthy growth and a solid bud yield from your autoflowers.

What nutrients does an autoflower need?

Autoflowering cannabis plants need the same essential nutrients as any other weed plant to grow healthy and pack on buds. Those nutrients fall into three groups: macronutrients, micronutrients and trace elements. These are the big ones for an autoflower:

1. Nitrogen (N): Key for vegetative growth, green leaves and protein synthesis. It's the macronutrient that matters most in the early stages.
2. Phosphorus (P): Builds strong roots and drives flower and bud production. It's a major macronutrient during the flowering stage.
3. Potassium (K): Needed for dense buds and for making the plant tougher against disease and stress. Another crucial macronutrient in flower.
4. Calcium (Ca) and Magnesium (Mg): Important for healthy cell structure and for heading off deficiencies tied to pH and soil.
5. Iron (Fe), Manganese (Mn), Zinc (Zn), Copper (Cu), Boron (B) and Molybdenum (Mo): These micronutrients and trace elements handle all kinds of metabolic jobs and keep nutrient deficiencies at bay.

Plenty of brands make cannabis-specific fertilizers, with nutrient blends designed for each stage of growth and flowering. Some well-known names are Advanced Nutrients, BioBizz, Canna and General Hydroponics, among others.

Besides bottled nutrients, you can also go the homemade route with compost infusions, compost tea or other natural nutrient solutions. Just make sure the plant gets the right amounts in the right balance, because deficiencies or excesses will hurt its health. Watching the plant closely and adjusting the feeding to what each growth stage needs is what makes or breaks an autoflower grow.

How can you grow a bigger autoflower?

If you want your autoflower to get bigger and stay healthy, these are the levers you can pull:

1. The right growing medium: Use a quality medium that already holds the nutrients the plant needs. An amended, nutrient-rich mix gives the plant a head start from day one.
2. A big enough container: Pick a container with plenty of room for the roots. More root space means a bigger, better-developed plant.
3. Enough light: Make sure your autoflower gets plenty of light. Cannabis needs solid lighting to grow at its best; if you grow indoors, look at quality LED, HPS or CFL grow lights.
4. Balanced nutrients: Feed what each stage calls for. Use cannabis-specific fertilizers with the right mix for each phase: nitrogen for vegetative growth, phosphorus and potassium for flowering.
5. Smart watering: Keep a steady watering routine so the plant never gets drought-stressed. Don't overdo it, though: too much water causes root problems and stunts growth.
6. Temperature and humidity: Keep your grow space in the right range. The sweet spot is about 20-28 °C (68-82 °F) during the day and around 18-22 °C (64-72 °F) at night.
7. Pruning and training: Selective pruning and training open up the plant so light spreads more evenly. That way the lower branches get their share too, and the plant grows bigger overall.
8. Pest and disease protection: Check the plant regularly for any sign of pests or disease and take preventive or corrective action when needed. Both can seriously hold back growth and development.

Dial these in and you'll get a bigger, healthier autoflower and a heavier harvest. Every plant is different, though, and some will need their own tweaks, so watch how yours develops and adjust as you go.

Autoflowers vs. photoperiods: which is better?

Choosing between autoflowering seeds and photoperiod seeds (regular or feminized) comes down to your personal preferences, your growing goals and the conditions you'll be growing in.

Autoflowers have a shorter life cycle because they flower on their own, regardless of the light schedule. That means you can grow them almost any time of year and in most climates, which makes them a great pick for beginners or anyone who wants a quick harvest. They also tend to stay short, so they're ideal for small grow spaces or growers who want to keep things low-key.

Photoperiod seeds, on the other hand, need a specific light schedule to start flowering. That gives the grower more control over how long the plant grows and when it flowers, which can mean bigger plants and heavier harvests when conditions are dialed in. Being larger plants, photoperiods can also out-yield autoflowers in the hands of an experienced grower.

Bottom line: autoflowers are ideal if you want fast harvests, have limited space or want a simpler grow, while photoperiods are the go-to for growers who want more control and bigger yields. The choice depends on what you need as a grower.