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Propagator box and seedling containers

Get the whole family involved in making a cosy space for nurturing seedlings. While you make the propagator, the kids can create the biodegradable containers and labels for growing.

Propagator box and seedling containers
As seen in kiwigardener

Propagator box (one for the grown-ups)

You will need

Materials:

  • 7mm plywood
  • 1.6mm x 16mm chain cut to 200mm length
  • 20mm screws
  • 50mm hinges (x 2)
  • Clear acrylic
  • Propagating heat pad (needs to easily fit within the drawers)
  • Recycled wooden drawers (x 2 – it’s better if one is slightly deeper than the other)
  • Resene EzyFill Quick ready mixed filler
  • Resene Lustacryl semi-gloss waterborne enamel tinted to Resene Seaweed
  • Resene Quick Dry

Tools:

  • Drill bits for drilling pilot holes
  • Long ruler
  • Marker pen
  • Paintbrush
  • Pencil
  • Putty knife or similar
  • Sandpaper
  • Saw
  • Screwdriver

Handy hint:  The seedling pots will need to be kept lightly moist (but not overly wet) in order for good germination and, once seedlings appear, you may need to lift the lid for a few hours during the warmer parts of the day to allow some air circulation.

Top tip:  When running a propagating heat pad (which is kept turned on 24 hours a day) it’s always safest to use it away from anywhere inside your living space, positioning it instead on a sheltered balcony or in a garage, shed or other outbuilding.

Instructions

How to build a propagator box:

How to build a propagator box - Step 1 Step one
Remove the handles from the drawers and then measure, mark and cut the bottoms out of both drawers, ensuring the cuts are perfectly parallel along each side.


How to build a propagator box - Step 2 Step two
The bottom back edge of the deeper drawer needs to be recessed approximately 5mm in from the other edges, as pictured. Many old wooden drawers come with this recess but if yours doesn’t it will need to be cut – this will provide a slot at the base through which to fit the propagating heat pad.


How to build a propagator box - Step 3 Step three
Fill handle holes and any other imperfections with Resene EzyFill Quick ready mixed filler. Once dry, sand smooth and wipe off any sanding residue with a clean cloth.


How to build a propagator box - Step 4 Step four
Measure, mark and cut a piece of 7mm plywood and a piece of clear acrylic the same size as the base of the drawers (use a pencil to mark the ply and a marker pen to mark the clear acrylic). Smooth any rough edges with sandpaper.


How to build a propagator box - Step 5 Step five
Attach the plywood to the base of the deeper drawer, as shown, fixing with 20mm screws. (The 5mm gap for the propagating pad should remain accessible.) Drill pilot holes first to prevent ply and wood from splitting.


How to build a propagator box - Step 6 Step six
Apply one coat of Resene Quick Dry to both drawer units and allow to dry.


How to build a propagator box - Step 7 Step seven
Apply two coats of Resene Lustacryl semi-gloss waterborne enamel tinted to Resene Seaweed to both drawer units, allowing two hours for each coat to dry.


How to build a propagator box - Step 8 Step eight
Attach the clear acrylic to the top of the second drawer, as shown, fixing with 20mm screws. Drill pilot holes first to prevent the clear acrylic and wood from splitting.


How to build a propagator box - Step 9 Step nine
Attach the two drawers together at the back with the two 50mm hinges and then fix the support chain in place with 20mm screws. Slide the propagating heat pad into the bottom of the unit through the accessible gap along one side of the base.


Seedling containers (one for the kids)

Make seedling containers
As seen in kiwigardener

You will need

Materials:

  • Corrugated cardboard
  • Egg carton
  • Ice block sticks
  • Plastic tray (to fit inside the propagator box)
  • Seed-raising mix
  • Seeds to sow (we used broccoli, carrot, cauliflower and pea seeds)
  • Thick wool
  • Toilet roll tubes

Resene testpots:

Tools:

  • Gloves
  • Scissors
  • Small paintbrushes
  • Small spoon

How to sow?  Sow two or three seeds in each container (check on the packet to see how deep) just in case they don’t all germinate. Once the seedlings appear, carefully remove the weakest looking ones, leaving a single, strong seedling in each container.

What happens next?  Place the plastic tray with seedling pots into the propagator box and carefully pour some water into the plastic tray to a depth of about 1cm – the cardboard seedling pots and potting mix will soon absorb this. Your grown-up helper will turn on the propagating heat pad and close the lid of the box to keep your seeds nice and warm. After a while they’ll germinate and begin to grow. Once they’re big enough, the seedlings can be planted directly into the garden, cardboard containers and all.

Instructions

How to build seedling containers:

How to build seedling containers - Step 1 Step one
Cut the toilet roll tubes in half and then cut the corrugated cardboard into rectangular pieces measuring 20cm x 9cm, with the corrugations running along the shortest length (you might need a grown-up to help you with this bit).


How to build seedling containers - Step 2 Step two
Cut the lid off the egg carton leaving a small flap of cardboard running along one edge, as shown (again, you might need a grown-up to help you here).


How to build seedling containers - Step 3 Step three
Roll each of the pieces of corrugated cardboard into a tube and fix securely with a piece of wool, as shown.


How to build seedling containers - Step 4 Step four
Tie the pieces of cut toilet roll tube in the same way. This will prevent the tubes from falling apart when they get damp.


How to build seedling containers - Step 5 Step five
Cut a few ice block sticks in half with the scissors (again, you might need a grown-up to assist with this). Paint carrots on the long ice blocks sticks using testpots of Resene Hyperactive and Resene Green House, pea pods on the half ice block sticks with testpots of Resene Green House and Resene Green Leaf, and broccoli/cauliflowers on the egg carton with testpots of Resene Parsley and Resene Rice Cake. Allow the paint to dry.


How to build seedling containers - Step 6 Step six
Place all the seedling containers onto the plastic tray and then carefully fill each one with seed-raising mix using a small spoon (remember to wear gloves when working with seed-raising mix). Insert the painted markers into the sides of the tube containers, as shown. Sow the carrot seeds into the taller cardboard tubes, the pea seeds into the toilet roll tubes, and the broccoli and cauliflower seeds into the egg carton – your grown-up assistant will need to help with this bit.

Words and photos by Mark Rayner

 

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