Grow Trays & Flood Tables

What is a flood table?

Hydroponic flood tables—also commonly called flood trays or ebb-and-flow tables—are rigid grow trays designed to temporarily fill with nutrient solution and then drain back into a reservoir. They are most commonly used in ebb and flow systems, where plants are periodically flooded and drained to deliver water, nutrients, and oxygen to the root zone. Flood tables are typically installed on a stand or rolling bench, with a reservoir and pump below that controls the flood-and-drain cycle.

When selecting a flood table or grow tray, it’s important to consider how it will integrate with your stand, bench, or rack system. Trays are typically listed with both inside dimensions (ID) and outside dimensions (OD). Outside dimensions determine whether the tray will physically fit into a stand or rolling bench, while inside dimensions determine how many plants, pots, or blocks can comfortably fit inside the tray. Understanding both measurements helps avoid spacing issues and ensures proper system compatibility.

Flood tables and grow trays are available in a wide range of sizes, making it easy to design an efficient grow room layout. At Hydrobuilder, we stock trays ranging from compact propagation sizes to large-format commercial tables used in greenhouses and indoor cultivation facilities. Most trays are available in common colors such as black, white, or gray, depending on light reflection and cleaning preferences. Many designs are stackable or nestable for easier storage and transport when not in use.

If you are unsure which flood table will fit your stand, let our experienced growers help you! Give us a call at 888-815-9763!

Seed Trays vs Grow Trays vs Flood Tables

While the terms are sometimes used interchangeably, seed trays, grow trays, and flood tables serve different purposes in a cultivation setup. Seed trays are shallow trays typically used for germination, cloning, and early propagation. They are often paired with humidity domes and may or may not include drainage holes, depending on the watering method.

Grow trays are deeper, more rigid trays designed to hold pots, blocks, or containers and to capture runoff from hand-watering or drip irrigation systems. These trays help keep grow spaces clean and allow excess nutrient solution to be collected and managed efficiently.

Flood tables, also known as ebb-and-flow tables, are specifically engineered to temporarily fill with nutrient solution and then drain completely. They require precise leveling, proper plumbing, and compatibility with pumps and reservoirs to function correctly. Flood tables are commonly used in automated hydroponic systems and commercial cultivation environments.

Choosing the right tray depends on your growing method, plant size, irrigation style, and whether you plan to automate watering or simply manage runoff.

Custom Flood Tables & Rolling Bench Systems

For large-scale or commercial cultivation, standard off-the-shelf flood tables may not always maximize space efficiency. Custom flood tables and rolling bench systems allow growers to design layouts that fit their exact room dimensions, plant spacing requirements, and workflow. Custom solutions are especially valuable in greenhouses and indoor facilities where maximizing canopy coverage directly impacts yield.

At Hydrobuilder, we work with industry cultivation professionals on a daily basis to help streamline the growing process from start to finish. Our inside connections with leading hydroponic manufacturers allow us to configure custom commercial rolling bench systems to fit your exact needs. We maintain a robust stock of grow trays and related equipment to ensure we can meet the demands of large-scale operations without delay.

Outfitting your grow facility with commercial-grade rolling benches allows you to smoothly roll your tables from side to side, eliminating the need for multiple aisles in your growing space. Eliminating these unnecessary aisles turns valuable wasted space into usable production space.

If you are looking to create a custom flood table or rolling benches for your hydroponic warehouse, grow room, or greenhouse, sign up for a commercial account today!

With a commercial account, you will get a dedicated sales rep, custom wholesale pricing, cultivation design assistance, and much more!

If you want to learn more about flood tables, stands, or rolling bench systems, give our team a call at 888-815-9763. Our experienced growers can help you determine the best setup for your space and cultivation goals.

Watering and Drainage

Proper watering and drainage are critical considerations when choosing grow trays and flood tables. Shallow trays are commonly used for seed starting and propagation, where bottom watering and consistent moisture levels support uniform germination. Deeper grow trays and flood tables are better suited for larger plants, containers, or automated irrigation systems where runoff collection or flood-and-drain cycles are required.

Depending on your irrigation method, trays can be customized by adding drain holes or used without drainage for bottom-watering applications. This flexibility allows growers to adapt trays to hand-watering, drip irrigation, or propagation setups across home gardens, greenhouses, and commercial facilities.

Our trays are also a top pick for growing microgreens and wheatgrass. The rigid, durable plastic construction ensures they hold up to repeated use, while their lightweight design makes them easy to transport and store. The perfect size and depth allow for efficient filling with soil or growing media, and the smooth edges make handling and cleaning a breeze. By using a drip tray or reservoir underneath, you can collect excess water, prevent leaks, and minimize waste—keeping your growing area clean and efficient.

Some grow trays and flood tables—such as many from Botanicare—are proudly made in the USA using high-quality, durable materials. Other brands we carry are manufactured domestically or internationally, depending on model and supplier. Check individual product details to confirm the origin of each tray option.