What Plants Thrive in RDWC?
One of the most common questions from new hydroponic growers is: what can you actually grow in an RDWC system? The short answer is — a lot. Recirculating Deep Water Culture (RDWC) suits a wide range of plants, from fast-growing salad leaves to large fruiting crops. The key is matching the right plant to the right system size.
Best Plants for RDWC — By Category
Fruiting Vegetables (High Yield, Most Popular)
Fruiting crops are where RDWC really shines. The constant supply of oxygenated, nutrient-rich water drives rapid vegetative growth and heavy fruiting — significantly outperforming soil in both speed and yield.
- Tomatoes — the most popular RDWC crop in the UK. Indeterminate varieties (like Gardener's Delight or Sungold) thrive in 20L buckets and can produce multiple kilos per plant per season.
- Cucumbers — fast-growing and high-yielding. Ideal for 6–8 bucket systems with good vertical space.
- Peppers and Chillies — slower to establish but extremely productive once in full growth. Both sweet peppers and hot chillies perform excellently in RDWC.
- Aubergines (Eggplant) — less common but very well-suited to RDWC. Require warm temperatures (22–28°C) and good lighting.
- Courgettes — vigorous growers that benefit from the consistent nutrient delivery RDWC provides. Best in larger bucket systems.
Leafy Greens and Herbs (Fast Turnaround)
Leafy crops grow exceptionally fast in RDWC — often ready to harvest in 3–4 weeks from transplant. They're ideal for growers who want quick results or want to run multiple harvests per year.
- Lettuce — one of the fastest and easiest RDWC crops. Butterhead, romaine, and loose-leaf varieties all perform well.
- Spinach and Kale — nutrient-dense leafy greens that grow rapidly in hydroponic conditions.
- Basil — thrives in warm, humid conditions and grows significantly faster hydroponically than in soil.
- Mint, Coriander, and Parsley — all well-suited to RDWC. Mint in particular grows vigorously and benefits from the contained root environment.
Root Vegetables (With the Right Setup)
Root vegetables are less common in RDWC but achievable with the right approach. Radishes and beetroot can be grown successfully, though they require modified net pot setups to support root development.
What Doesn't Work Well in RDWC?
Very large root vegetables (carrots, parsnips) are not well-suited to standard RDWC bucket systems. Strawberries and other trailing fruits are better suited to NFT (Nutrient Film Technique) or Dutch bucket systems.
Choosing the Right System for Your Crop
The size of your RDWC system should match your plant count and crop type:
- Leafy greens and herbs: Our 4-Bucket Bundle is ideal — fast turnaround, easy management.
- Tomatoes, peppers, cucumbers: The 6-Bucket or 8-Bucket Bundle gives these larger plants the root space and nutrient volume they need.
- Mixed grows: The 8-Bucket ProControl System lets you run different crops simultaneously with automated management.
Browse our full All Hydroponics collection to find the right system for what you want to grow.