Schwazzing in soil: selectively reduce leaf mass

## Introduction

**Swazzing** is a special, highly standardized form of defoliation. Unlike general leaf removal in the vegetation phase, this involves **two clearly timed interventions**: once directly before the change to flowering and a second time around **at the end of the stretch around flowering day 21**. The aim is to achieve a very open canopy with high light penetration and better air circulation.

This guide is **not a general defoliation guide** and **not a lollipopping guide**. The core of the method is the targeted reduction of large fan leaves at fixed times. Because the procedure is relatively intensive, it is only suitable for **strong photoperiodic plants** in **soil/soil cultivation**. Schwazzing is unsuitable for weak plants or sensitive autoflowers.

## When Schwazzing makes sense

Schwazzing is particularly suitable when:

- the plant is **very vital and strongly rooted** in soil

- the canopy has become **extremely dense**

- many bud sites are already visibly covered before the flowering change

- the air circulates poorly through the inside of the plant

- you are working with vigorous, well regenerating genetics

In Soil-Grow it is important: soil **buffers nutrients** and reacts more slowly than coco or hydro. Therefore, the plant should be **stable** before any intervention. Do not carry out Schwazzing if the soil is too wet, very dry or the plant is already stressed.

## Appropriate phase and clear limits

### First intervention: end of vegetation

The first Schwazzing pass takes place **shortly before photoperiodic plants are switched to 12/12**. In this phase, the plant can still be structurally prepared for the upcoming flowering.

In particular, the following are removed:

- large fan leaves that directly shade bud sites

- leaves growing inwards in the dense center

- Leaves that lie on top of each other and promote air congestion

Should not be removed:

- small sugar leaves on young flower heads

- healthy shoot tips

- whole side shoots only in the context of Schwazzing

### Second intervention: around flowering day 21

The second operation takes place **after the stretch**, usually around **day 18 to 24 of flowering**, often around **day 21**. The basic structure is then set and superfluous fan leaves can be removed again to expose the inflorescences that have now formed.

**Important:** No more heavy defoliation after this. From this point onwards, the risk of unnecessarily disrupting flower development and regeneration increases. Heavy HST from flowering week 3 is not recommended.

## How to carry out Schwazzing correctly

### Preparation in the Soil-Grow

- Only work on **healthy plants** without symptoms of deficiency or overwatering.

- The soil should be **slightly moist, but not wet**. Use the **finger test** and avoid interventions directly after heavy watering.

- Use **clean, sharp scissors** or remove leaf stalks cleanly by hand without tearing the bark.

- Keep the **pH in the soil range of 6.0 to 7.0** so that the plant continues to work stably after the procedure.

### First pass

Go from top to bottom and selectively remove large fan leaves that:

- shade several shoots at the same time

- protrude deep into the plant

- hardly contribute to light absorption, but block a lot of space

Leave enough leaf mass so that the plant can continue to assimilate vigorously. Schwazzing is intensive, but **not a complete shaving of every green surface**.

### Second pass

At the end of the stretch, large fan leaves are again removed if they are now covering fresh inflorescences. Work selectively again and concentrate on:

- large, shady leaves in the upper and middle zone

- Leaves with a large area of overlap

- Leaf mass that creates air pockets in the dense canopy

## Typical defects

- Too early application** on still small plants

- Schwazzing with **autoflowers** despite short recovery time

- Intervention on plants with **root stress or nutrient problems**

- remove too much leaf mass at once, although the plant already reacts sluggishly in soil

- continue to defoliate heavily after day 21 and thus stress the flower unnecessarily

## Who this method is suitable for

Schwazzing is suitable for experienced growers who:

- cultivate vigorous photoperiod varieties in soil

- want to open a dense indoor canopy in a targeted manner

- can keep to a precise timing

- consciously want to work with an **intensive but clearly limited defoliation strategy**

Those with little experience are usually safer with milder defoliation. Schwazzing is not a compulsory technique, but a **specialized training method** for robust plants and clean timing.

## Pro Tips

- Only use on vital photoperiods

- Autoflowers do not blacken

- Keep soil only slightly moist before handling

- No more strong defoliation after day 21

- Only remove large, shady fan leaves