A Story From the Field: The Orchids Survived, the Office Did Not

Praew is in her thirties and took over her father's orchid nursery in Damnoen Saduak district, Ratchaburi. The nursery sits beside a small canal and has several shade-net houses full of Dendrobium, Mokara and Vanda orchids grown for the wholesale market and for online orders. At the front of the property is a single-storey building divided into a small office, a corner where walk-in customers browse, a packing room where plants are boxed for courier delivery, a staff bathroom, and a store for coconut husk, charcoal, pots and cardboard boxes.

During the 2026 floods, Praew and her workers raced to lift the orchids onto higher benches and carried the most valuable potted plants to higher ground. Most of the plants made it. The front building did not fare so well. Water came in to about mid-shin height and stayed for several days. When it finally drained, the packing room smelled musty and muddy, the stacked cardboard boxes had gone soft and collapsed, the coconut husk in the store was covered in fluffy white mold and smelled sour, and a line of black spots had appeared along the office walls exactly where the water had stood. Walk-in customers started to comment politely that "the shop smells a bit damp".

The hardest part was online. A few customers mentioned in their reviews that the box their plant arrived in smelled musty. Praew wanted to have the building ozone-treated to get rid of the smell, but she had also heard that "ozone kills plants", and her office is only a few metres from the nearest grow house. This article explains how to deal with the site zone by zone, built around one firm rule: we never ozone-treat plants, and we never spray disinfectant onto a single plant.

Why Ozone Is Never Used on Plants

Ozone is a highly oxidising gas. That is exactly why it works so well at destroying mold spores and breaking down odor molecules indoors. The same property, however, damages plant tissue. Leaves can develop pale spots or scorched edges, and flowers can wilt early. Orchids in bloom and delicate foliage plants are especially sensitive. That is why, in every WHD job, plants of every kind are kept out of the treatment area, exactly as people and pets are.

Chemgene HLD4H disinfectant is designed to disinfect building surfaces and air, not to treat plant diseases. It is not sprayed on plants, leaves or flowers. If your orchids are showing rot, leaf spots or root damage after the flood, please consult the Damnoen Saduak district agricultural office or an orchid specialist, so the treatment matches the actual disease.

The good news is that most of the mold and musty odor problems at a plant shop after a flood are not in the plants at all. They are in the building, the walls, the boxes and the soaked potting materials. Those are areas that can be treated safely, once the plants have been moved far enough away.

The Damage Plant Shops Often Overlook

• Staff health. Workers who spend all day packing plants in a moldy room may cough, sneeze, get itchy eyes or find their allergies flaring up. Anyone who waded through floodwater carrying stock is at risk of skin infections and leptospirosis. If someone develops a high fever and aching calves after being in floodwater, they should see a doctor.
• Musty odor travelling with the product. Boxes, wrapping paper and packing fill stored in a damp room absorb odor and carry it straight to the customer's door.
• Online reviews. Online plant shops live on reviews. A handful of comments about a musty smell or mold marks on a box can affect sales for months.
• Contaminated potting materials. Coconut husk, charcoal and potting mix that sat in floodwater become a source of mold and can carry germs from the floodwater into newly potted plants.
• Documents and office equipment. Receipts, account books, the label printer and the parcel scale in a damp office are all at risk of mold and damage.

Common Fixes That Fall Short

• Air freshener or bowls of charcoal in the packing room. They mask the smell for a short while, but the mold in the walls and boxes is still there, and the fragrance can end up on the parcels.
• Wiping walls near the grow houses with bleach. The fumes can drift towards the plants, and bleach dripping into the soil does the plants no favours.
• Sun-drying moldy coconut husk and reusing it. The surface mold may fade, but spores remain deep in the fibres, and material that sat in floodwater may be contaminated.
• Painting over the mold on the office walls. If the wall is still damp inside, the new paint will blister and mold will grow back underneath it.
• Running fans all day. It speeds up drying, but it also blows spores from the packing room through the whole building and, depending on the wind, towards the grow houses.

Why Canal-Side Nurseries in Damnoen Saduak Stay Damp for So Long

Damnoen Saduak is famous for its network of canals, and that is exactly what makes recovery slower here than in many inland areas. Several local conditions work together to keep buildings damp long after the water has gone:

• High groundwater. Land beside the canals stays saturated for weeks. Moisture rises into concrete floors and the base of brick walls, so a room can feel dry at head height while the bottom of the wall is still wet.
• Daily watering next door. A nursery waters its plants every day. Humid air from the grow houses drifts into the office and packing room, especially in the early morning.
• Low buildings with small windows. Many front buildings on older nurseries were built cheaply as simple sheds, with few openings for cross-ventilation.
• Organic material everywhere. Coconut husk, cardboard, wooden benches and paper are all food for mold, and a plant business has plenty of each.

Understanding these conditions explains why a single clean-up is not the end of the job. The aim is to remove the mold and odor that are there now, and then change the way the building is used so they do not return.

Zone the Site First: The Heart of Treating a Plant Business

Before any fogging or ozone treatment starts, our team walks the site with the owner and divides it into zones, deciding exactly what can be done in each one.

• Red zone (no ozone, no disinfectant spray). The orchid houses, potted-plant benches, propagation beds and anywhere else plants are kept, including the decorative plants in the customer corner, which must be moved out beforehand.
• Yellow zone (surface disinfection only, no ozone). Semi-open areas next to the grow houses, such as the walkway outside the packing room. Here we clean and disinfect surfaces only, choosing a time when the wind is not blowing towards the grow houses.
• Green zone (fogging and ozone allowed). The office, packing room, staff bathroom and store, provided the doors and windows close properly and every plant has been taken out.

Zoning like this gave Praew confidence that the orchids she had worked so hard to save during the flood would not be harmed by the clean-up afterwards.

WHD's Disinfection and Ozone Process for Plant Shops

1. Survey and zoning. We check water height, mold hotspots, odor sources, the prevailing wind direction and the distance between the building and the grow houses.
2. Move the plants and clear the space. Every plant is moved out of the green zone. Collapsed cardboard boxes, flood-soaked coconut husk and potting materials are thrown out. Mud is removed and floors are cleaned.
3. Disinfection fogging with Chemgene HLD4H. A ULV fogger fills the inside of the building with a very fine mist that reaches room corners, the underside of packing tables, box shelves and the bathroom. CHEMGENE HLD4H disinfectant has no harsh smell and is used according to its label instructions.
4. Ozone treatment inside the sealed building. All doors and windows are closed and a dose of ozone matched to the room size helps destroy mold spores and break down the musty odor trapped in walls and ceilings.
5. Careful ventilation. We open the side of the building facing away from the grow houses first, and only open the garden side once the ozone has fully broken down.
6. Re-check and move back in. When there is no smell and the air is fresh, decorative plants and equipment go back in, and we give advice on keeping boxes and packing materials dry.

Safety: during ozone treatment there must be no people, pets or plants inside the building. The label printer, computers and sensitive parcel scales should be moved out or covered. Rubber items such as rubber bands and hoses are removed beforehand. The ozone dose is controlled to suit the size of each room.

Potting Materials and Stock: What to Keep, What to Throw Away

Plant businesses hold a surprising amount of stock that is not plants. After a flood, it helps to sort it methodically rather than deciding item by item in a rush.

• Coconut husk, sphagnum moss and potting mix that sat in floodwater: throw away. These materials hold water for a long time and are ideal homes for mold.
• Charcoal and clay pebbles that were submerged: these are harder, but they are porous and may hold floodwater contaminants. Most growers choose to replace them rather than risk new plants.
• Plastic and glazed pots: can usually be scrubbed, washed with clean water, dried in the sun and reused.
• Unglazed clay pots: wash and dry thoroughly. If they still smell or show mold marks after drying, set them aside for non-sale use.
• Cardboard boxes and paper wrapping: anything that got wet or shows mold marks should be recycled or discarded. Dry, unmarked stock can stay in the room during ozone treatment to help reduce absorbed odor.
• Tools such as secateurs and wire: clean, dry and oil them to stop rust.

After the Service: Keeping the Packing Room From Smelling Musty Again

Once the building is clean, the fastest way for musty odor to come back is fresh moisture. A plant shop is naturally more humid than most businesses, because plants are watered every day and the grow houses are right next door. A few simple systems help a great deal:

• Separate wet and dry areas. Pot washing and watering plants before packing should happen outside the packing room, or at least in a clearly separate corner, so water never splashes onto boxes.
• Keep boxes and packing materials off the floor. Store them on shelves, with a small gap from the wall.
• Order boxes to match your shipping cycle. Large stocks of cardboard sitting for months act like sponges for moisture.
• Ventilate during the day. In the rainy season, run a dehumidifier in the packing room.
• Disinfect high-touch surfaces. Packing tables, door handles and scales can be wiped with CHEMGENE HLD4H spray, never sprayed onto plants.
• Photograph the old mold spots every week. If a new spot appears, send the photo to our team for a quick assessment.

These small habits help make sure every parcel leaving Damnoen Saduak reaches the customer smelling of fresh plants, not of floodwater.

Protecting Your Team During the Clean-Up

Small nurseries usually rely on a handful of long-standing workers, and often on family members as well. Clearing out moldy boxes and soaked potting materials is dirty work, so a little protection goes a long way:

• Gloves, boots and a well-fitting mask for anyone moving moldy materials or shovelling mud.
• Cover cuts and scratches with waterproof dressings before starting work. Plant work already causes plenty of small cuts.
• Bag moldy material before carrying it through the building, so spores do not drift into the clean areas.
• Wash hands and change clothes before handling healthy plants or packing customer orders.
• Keep children and elderly relatives away from the clean-up and from the discard pile.

A Simple Plan to Get Back to Shipping Orders

Every site is different, but many plant shops find it easier to recover in clear stages rather than trying to do everything at once:

1. Stage one, save the plants. Move plants to dry, raised benches and get advice from agricultural experts on any that show disease.
2. Stage two, clear the building. Throw out wet boxes, soaked potting materials and anything with mold marks. Remove mud and wash floors.
3. Stage three, disinfect and deodorise. Fog the empty office, packing room, bathroom and store, then ozone-treat the sealed building with all plants outside.
4. Stage four, dry and restock. Ventilate, run a dehumidifier, and bring in fresh boxes and potting materials only once the room smells clean and dry.
5. Stage five, restart and monitor. Resume shipping, keep an eye on the old mold spots, and ask a trusted customer or two whether their parcels arrive smelling fresh.

Following these stages keeps the business moving while protecting both the plants and the shop's reputation.

10 Reasons Plant Shops in Damnoen Saduak Choose WHD

1. We understand plant businesses, so we never ozone-treat or spray disinfectant on a single plant.
2. The site is clearly zoned before work starts, and planning takes the real wind direction into account.
3. Fine-mist disinfection fogging reaches under packing tables and behind box shelves.
4. Chemgene HLD4H has no harsh smell and does not leave a scent on parcels.
5. Ozone treatment inside the sealed building breaks down musty odor rather than masking it.
6. Practical advice on which potting materials and boxes to throw away.
7. Controlled ozone dosing and care for sensitive office equipment.
8. Scheduling that keeps the shop's packing downtime as short as possible.
9. Mosquito spraying for canal-side gardens where mosquitoes surge after the water drops, planned together with the owner.
10. Easy to reach on LINE. Send photos and a rough layout of your site for an initial assessment.

Before and After: Praew's Orchid Shop

In the Customer's Words

"The orchids were my biggest worry. The team walked the nursery with me first, had me move every decorative plant out of the office, and treated only the parts of the building that could be closed. When they ventilated, they opened the side away from the grow houses first. The packing room doesn't smell any more, and the orchids are still flowering as normal."

— Praew, orchid nursery and plant shop, Damnoen Saduak district (illustrative scenario)

Frequently Asked Questions

Q: Can you ozone-treat the orchid houses to kill fungus?
A: No. Ozone damages plant tissue, and WHD does not use ozone anywhere plants are present. If your orchids are diseased, please consult the agricultural office or an orchid specialist.

Q: The office is right next to a grow house. Will ozone leak out to the plants?
A: We seal the building, control the dose and plan ventilation so the air leaves on the side facing away from the grow houses. If the building cannot be sealed properly, we focus on surface disinfection instead.

Q: Can coconut husk that sat in floodwater be sun-dried and reused?
A: We do not recommend it. Flood-soaked potting materials may hold floodwater germs and deep-seated mold spores. Replace them with new material stored in a dry place.

Q: Can I keep boxes and packing fill that did not get wet but smell musty?
A: If they are completely dry with no mold marks, they can stay in the room during ozone treatment to help reduce the smell. If they are marked or soft, throw them away.

Q: How long will the shop need to close?
A: It depends on the size of the building and the amount of work. We plan to keep packing downtime as short as possible and tell you when it is safe to go back in after ventilation.

Q: Will disinfectant run off into the garden soil?
A: Fine-mist fogging uses a small amount of liquid and is done inside the building. It is not poured onto garden soil and is never sprayed on plants.

Q: Can you also treat our house on the same property?
A: Yes. Homes can be treated in the same visit, following the same rules: everyone, pets and houseplants out during ozone treatment, and back in only after ventilation.

Q: Do I need to empty the office of documents and computers?
A: Important documents are best taken out or sealed in plastic boxes. Computers, the label printer and parcel scales should be moved out or covered, because ozone and electronics need a controlled approach. Our team will tell you what to move during the survey.

Q: The walls still show stains after treatment. Does that mean the mold is still alive?
A: Not necessarily. Disinfection and ozone deal with germs, spores and odor, but they do not remove old water stains. Once the wall is fully dry, it can be cleaned and repainted. If new spots appear or old ones spread, send us a photo so we can take a look.

A Clean Office and Packing Room, With Every Plant Kept Safe

Serving orchid nurseries, plant shops and homes in Damnoen Saduak, Bang Phae, Photharam and nearby areas of Ratchaburi and Samut Sakhon.

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Call 065-556-6294 · LINE @whd268 · Email worldhealthdisinfection@gmail.com

Related Pages and Sources

• Ozone treatment for odors and chemical residue
• Master Ozone Generator
• CHEMGENE HLD4H spray disinfectant
• All articles
• External sources: WHO: Floods and health and Thailand Department of Health

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Keywords: ozone treatment for orchid nursery office after a flood, plant shop after flood, packing room disinfection, mold removal, musty odor removal, Damnoen Saduak, Ratchaburi 2026