9 Expert Tips for Successful Transplanting: From Greenhouse to Garden

Transplanting seedlings from the greenhouse into your garden is such a rewarding experience, but it can also be a stressful time for your plants. The sudden change in environment, temperature, and humidity can be a shock to the seedlings, and they may struggle to adapt. With a little care and attention, your seedlings will have a successful transition from your backyard greenhouse to the garden. Here are some helpful tips for transplanting success.

1. Make sure the seedling is ready to be re-potted.
Gently tip the potted plant and squeeze the container toward the bottom. The entire soil-mass and plant roots should bind together - it can be a little loose, but it should have some structure. If not, the roots might not be developed enough for transplanting.

2. Choose the right time to transplant
Transplanting seedlings is best done on a cool, cloudy day or in the late afternoon or evening when the sun is not as strong. This will give the seedlings time to adjust to their new environment before they are exposed to strong sunlight.

3. Acclimate the seedlings
Before transplanting, it is important to harden off the seedlings. This means gradually exposing them to outdoor conditions over a period of several days. Start by placing them in a protected, shady spot for a few hours a day (like a covered porch), gradually increasing their exposure to the new temperature, light levels and wind for a few days. This will help them to toughen up and prepare for the change in environment.

4. Prepare the soil
Prepare the soil in your garden bed before transplanting. Remove any weeds or debris, and loosen the soil to a depth of at least six inches. Add compost or other organic matter to improve the soil structure and fertility.

5. Water the seedlings
Water the seedlings thoroughly before transplanting to ensure that the root ball is moist. This helps hold the rootball together and reduces shock by ensuring the plant is not under stress (from lack of water).

6. Dig the planting holes
Dig planting holes that are slightly larger than the root ball of your seedlings. Make sure the holes are deep enough to accommodate the entire root system. You might want to add some fresh potting soil or compost to the hole before adding the plant.

7. Gently remove the seedlings from their containers
Gently remove the seedlings from their containers, being careful not to damage the roots. If the roots are tightly bound, gently loosen them with your fingers or a tool.

8. Plant the seedlings
Plant the seedlings in the prepared holes, making sure that the soil level around the seedlings is the same as it was in the container. Firm the soil around the plant and water it again.

9. Monitor and care for the seedlings
Monitor the seedlings closely for the first few weeks after transplanting. Water them regularly, and keep an eye out for any signs of stress or disease. Mulching around the base of the plants can help to retain moisture and suppress weeds.

Transplanting seedlings from the greenhouse into the garden can be a delicate process, but with a little care and attention, you can ensure that your seedlings make a successful transition. By following the helpful tips above, you will help your plants thrive in their new outdoor home.