Ruud Kleinpaste runs us through his top tips for sowing seeds!
We’re in the middle of seed-sowing season; Longer days and warmer temperatures are the natural conditions that Nature favours for the regeneration of plants through seeds. This generally goes for flowering plants (think: wild flower meadows!) as well as vegetables.
Generally speaking, sowing seeds has a few common do-s and don’t-s
With a few exceptions, it pays to sow seeds in a nice bed of seed-raising mix, to make them sprout and grow a little, before you can transplant them into their final growing place, be that the garden or in pots
Let’s start with the exceptions:
Summer root vegetables and plants that hate to be transplanted should be sown in situ… Parsnips, radishes and carrots are great examples of fussy transplanters. Nikau palms, grass trees and Dracophyllum are also devils to transplant!
The vegies should be sown in perfectly prepared soils without rocks or lumps (they will cause splitting of carrots and parsnips and deformation in radishes)
Try to sow each (rather tiny) seed 7 or 8 cm apart (think of the spacing when they are full-grown)
It’ll be hard with those tiny seeds – can always thin them out carefully, when half-grown.
Nikaus and other specimen plants could be carefully transplanted into larger pots if so required… making sure you don’t disturb the rootball.
“Regular” sowing in seed raising mix:
This mix is important as it is sterile and that limits fungal problems such as “damping off”
The mix is also very fine; it holds water nicely, without becoming waterlogged
Those are the two extremes you’ll have to juggle with when sowing seeds: keep’em moist – not wet
Don’t bury your seeds too deep in the mix; if there are germination problems, it’s usually because they’ve been buried!
Golden rule: cover with a layer of mix around the same thickness as the size of the seed
Hardly covered at all !!!
Don’t use watering cans to water the newly-sown seeds, as that may totally disturb the delicate balance and cause water “runners” and miniature typhoon flooding symptoms: best to use a plant misting bottle to keep the top layers moist;
Gentle watering via mist!!
Do we need to warm the seed-raising mix?
Some species (tropical ones) quite like a warmer stratum to germinate (tomatoes, chilies and capsicums germinate much better that way; Basil and Cucurbits – pumpkins, melons and such fruit- will also thank you for the warmth).
Use a flash propagation pad (like the electric blanket for seedling trays) underneath the mix, making sure you don’t dry out the mix too quickly. Some folk use old bain-Marie systems with steam and warmth.
Keep seeds in the dark, no problem, but once the cotyledons (the first two seed leaves) have emerged, they need light to photosynthesise; Not blazing sunlight, but filtered light is best.
Grab yourself some seed catalogues (Kings Seeds, Yates, Egmont etc) and dream of what you may grow … Try the weird stuff - you might like it!