Parsley
Petroselinum crispum
Overview
Parsley is an excellent candidate for NFT (Nutrient Film Technique) hydroponic systems. Although it has a notoriously slow germination rate, once the root system is established in the NFT channel, it grows vigorously and allows for continuous 'cut-and-come-again' harvesting for several months.
Growing Requirements
pH Range
5.5 - 6.5
EC Range
0.8 - 1.8 mS/cm
TDS Range
400 - 900 ppm
Temperature
15°C - 25°C
Light Requirement
Medium (14 hours/day)
Nutrient Needs
Growth Timeline
Germination
14-21 daysSeeds are slow to germinate. Soaking seeds in warm water for 24 hours prior to sowing in rockwool or starter plugs can speed up the process.
Seedling
2-3 weeksPlants develop their first true leaves. Maintain high humidity and ensure roots are emerging from the starter plug before moving to the NFT system.
Vegetative Growth
4-5 weeksOnce in the NFT channel, roots expand rapidly into the film of nutrient solution, and foliage becomes dense. Nutrient strength can be gradually increased.
Common Issues & Solutions
Root Rot (Pythium)
- Brown, slimy roots
- Wilting leaves
- Stunted growth
- Reservoir temperature too high (>24°C)
- Low dissolved oxygen levels
- Use a water chiller
- Increase aeration with air stones
- Use beneficial bacteria or hydrogen peroxide treatment
Tip Burn
- Browning on the edges of young leaves
- Calcium deficiency
- Inconsistent humidity
- Poor airflow preventing transpiration
- Add Cal-Mag supplement
- Improve air circulation with fans
- Check pH levels
Crown Rot
- Mushy stems at the base
- Yellowing lower leaves
- Planting too deep
- Excessive moisture around the stem base
- Ensure the crown is above the substrate/water line
- Improve ventilation around the base of the plant
Harvesting Guide
When to Harvest
Begin harvesting when the plant has at least 10-15 stems and the outer stems are about 6 inches long.
How to Harvest
Harvest the outer stems first by cutting them near the base of the plant. Always leave the inner, younger leaves (the crown) intact to ensure continued growth.
Storage Tips
Place cut stems in a glass of water in the refrigerator or wrap them in a damp paper towel and store in a plastic bag.
Expected Yield
High; a healthy plant in an NFT system can provide weekly harvests for 3-5 months.
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