Choosing Regular Towers Over High-Density Towers When Starting a Tower Farm

by | Aug 25, 2025

Why Most Tower Farms Should Begin with Regular Towers

Starting a Tower Farm involves many decisions, but one of the most important is choosing the right tower model. At Agrotonomy, we consistently advise new farmers to begin with regular towers. They are easier to manage, more versatile, and better suited for a wide range of crops and farm sizes. This guide compares regular and high-density towers across all relevant criteria, drawing on years of practical experience and real-world feedback from Tower Farmers globally.

Understanding the Evolution: Microgreen, Baby Green, and High-Density Towers

When first introduced, the tower now known as the high-density tower was originally launched as a microgreen tower. However, the term was misleading. These towers were never used for true microgreens, which are harvested much earlier and are significantly smaller than baby greens. Recognizing this, they were renamed “baby green towers,” a term that clearly reflected the actual crops being grown: leafy greens harvested young, typically when 8 to 12 cm (3 to 5 in) tall. This name was widely adopted and better communicated the tower’s purpose.

Unfortunately, the manufacturer later changed the name again to “high-density towers,” which has created confusion. On our website, you will still find references to microgreen or baby green towers—these all refer to the same model. While the name has changed, the design and functionality have not. From our perspective, “baby green tower” remains the most accurate and meaningful name for what this tower does.

Technical Specifications: Full Breakdown

Regular Aeroponic Towers

Diameter: 22 cm (8.7 in) per section
Height per stackable section: 19 cm (7.5 in)
Ports per section: 4

Configurations:
• 7 sections – 28 planting ports – 1.8 m (5 ft 11 in) high
• 9 sections – 36 planting ports – 2.1 m (6 ft 11 in) high
• 11 sections – 44 planting ports – 2.5 m (8 ft 2 in) high
• 13 sections – 52 planting ports – 2.9 m (9 ft 6 in) high

High-Density (Baby Green) Towers

Diameter: 22 cm (8.7 in) per section
Height per section: 9.5 cm (3.7 in)
Ports per section: 8

Configurations:
• 13 pots – 100 ports – 1.8 m (5 ft 11 in) high
• 17 pots – 132 ports – 2.1 m (6 ft 11 in) high
• 21 pots – 164 ports – 2.5 m (8 ft 2 in) high
• 25 pots – 196 ports – 2.9 m (9 ft 6 in) high

Common Reservoir Specs (both tower types)

Base diameter: 73 cm (28.7 in)
Height: 36 cm (14.2 in)
Total volume: 70 liters (18.5 gal) – operated with 50 liters (13.2 gal)
Pump: 50 W, on a timer (3 minutes ON / 12 minutes OFF)

• Integrated float valve and drain valve
• Internal support: 2 stainless steel rods per tower

Root Space and Crop Suitability

High-density towers offer four times the number of planting ports as regular towers, but this comes at the cost of root space. Each plant has significantly less room to grow. As a result, these towers are best suited for growing baby leafy greens, harvested when they reach about 8 centimeters (3 to 4 inches) in height. They perform well with most types of baby lettuces, tender greens, and a limited range of aromatic herbs that thrive in compact root environments.

Regular towers, on the other hand, can support the full crop cycle of nearly every leafy green and a wide variety of aromatic herbs. They’re also ideal for growing crops with larger root systems, including all the heavy brassicas such as cabbages, cauliflower, and broccoli, as well as fruiting and flowering plants like tomatoes and cucumbers when used with a grow cage. In total, more than 200 different crops can be cultivated successfully. For reference, see what can be grown on a regular tower in our Aeroponic Tower Cultivation Guide.

In the right climate conditions, regular towers are also best suited for growing strawberries. After more than 10 years of comparative testing conducted outdoors, indoors under LED lighting, and in greenhouses, we’ve found that strawberries perform significantly better on regular towers than on high-density models, both in terms of yield and operational efficiency.

Nutritional Quality and Plant Performance

Based on scientific comparative tests published on our website, crops grown on our aeroponic towers have shown levels of nutrient density, flavonoid content, and antioxidant concentration as high as the best results ever recorded for organic soil-grown vegetables.

These characteristics are most noticeable when plants are harvested with their root systems intact, as they are with regular towers.

Yield Comparison: Quantity vs. Usability

Yield per Tower Over a 30-Day Period (in a climate-controlled greenhouse):

  • Regular tower (2.9 m / 9 ft 6 in), 52 ports: approximately 10 kg (22 lb) of mature leafy greens per harvest
  • High-density tower (2.9 m / 9 ft 6 in), 196 ports: approximately 5 to 6 kg (11 to 13.2 lb) of baby greens across 3 to 4 harvests
  • While baby greens tend to sell at a higher price per kilogram, the total yield by weight is still lower. More importantly, they must be sold quickly due to their perishable nature, which increases risk and operating pressure.

Harvest Cycles and Labor Input

Regular Towers

  • Harvest every 4 to 6 weeks
  • Whole plants pulled with roots
  • Minimal handling
  • Easy to store or sell with long shelf life
  • Labor involved when cleaning: 13 sections per tower

High-Density Towers

  • Harvest every 10 to 12 days
  • Fresh-cut crops only
  • Roots and medium stay in tower
  • Labor-intensive: wash, dry, weigh, and bag
  • 3 to 4 harvests per cycle
  • Cleaning: 25 to 26 sections per tower

Labor Inputs

  • 4 times more effort in planting, seedling, and cleaning
  • 12 times more work in harvesting and post-processing
  • 30 to 50% more seeds per tower
  • 4 times more growing medium (rockwool or coco coir) per cycle, which ends up being very expensive

These extra steps add complexity and require a reliable processing setup, which many small farms lack.

Shelf Life: The Critical Difference

Regular towers allow for harvesting full plants with their roots, which dramatically extends shelf life, often 7 to 10 days longer than fresh-cut baby greens. In contrast, baby greens harvested from high-density towers must be consumed quickly, often within 48 hours, to avoid spoilage.

This makes regular towers far more forgiving when selling directly to consumers, markets, or restaurants. Baby greens, however, demand fast tu

Space Efficiency and Sustainability

High-density towers are compact and space-efficient. A full 2.9 m (9 ft 6 in) tower with 208 planting ports can grow crops in less than 1 m² (10.8 sq ft) of floor space. From a design standpoint, this is one of the most vertically optimized and eco-efficient farming systems available for baby greens.

However, this advantage only plays out when the farm has a streamlined workflow and sufficient labor to support the short harvest cycles.

Who Should Consider High-Density Towers?

High-density towers are an excellent choice for:
1. Hotels, restaurants, or resorts growing baby greens for in-house consumption
2. Controlled-environment farms with automated washing and packaging
3. Larger farms (200 to 300 towers minimum) with secured, consistent markets to sell their crops

They are not suitable for:
1. Outdoor farming
2. Farms without refrigeration or processing space
3. Small or entry-level Tower Farms

Many clients who invest in just 10% high-density towers alongside regular ones later regret the decision. Without the right infrastructure and sales pipeline, the added labor and perishability outweigh the benefits.

When the First Harvest Is the Best

High-density towers can support multiple harvests per crop cycle, but most Tower Farmers report a noticeable decline in quality after the first cut. Leaves become thinner, less flavorful, and more fragile. This makes it difficult to maintain consistent quality across harvests unless conditions are perfectly controlled.

Why Regular Towers Make the Most Sense for Starting Out

Baby green towers are a highly specialized tool. They can deliver impressive results under the right conditions, especially in large-scale, climate-controlled environments with immediate access to buyers. But for most Tower Farmers, especially those just getting started, these towers often create more complications than benefits.

Regular towers offer a more manageable approach. They require less labor, produce crops with longer shelf life, and are suitable for a wider range of crops and growing conditions. They are also ideal for gradual scaling and more resilient to post-harvest challenges.
For anyone starting out with Tower Farming, regular towers are the smarter, more reliable choice.

Examples of Regular Aeroponic Towers

Oak-Leaf Lettuce

Basil

Dill

Oregano