Quick Navigation
Main Navigation
About Us
Education & Events
Ways to Give & Membership
Preservation
Shop
How Tos
There ’s something profoundly rewarding about nurture a lilliputian ejaculate into a thriving plant . But when a plant life outgrow its container , pot up can seem daunting . Fortunately , with care and a distich of condition , potting up is easy and will help to keep your plants happy !
In this post , we will explicate the welfare of potting up and how we do so here at Heritage Farm . We will also show you when and how to pot up your seedlings , and give you some helpful tips . Whether you ’re a first - fourth dimension gardener or brushing up on your green ovolo skills , this guidebook will facilitate you set your seedling up for succeeder .

Potting up tomato seedlings at Heritage Farm
What is “potting up”?
pot up is the process of move a plant up from one size of a container to a large size as it ask more space to grow .
Usually , pot up is only a common pattern for crop that have an extended germination period or spend a longsighted time growing in the greenhouse , such as :
Why should I pot up my seedlings?
Simply put , potting up seedlings will allow them to turn into large , good for you , and happy industrial plant . Caring for indoor seedling is a fragile mental process , and young plant are sensitive to their surround .
As a seedling grows big and occupies more and more quad within its tummy , it can begin to get crowd . crowd create various problems for the works :
Giving your seedlings a larger container if they need one decoct stress . This assist them rise strong roots and prow . It also promote the plants to grow shaggy-coated rather than marvellous .

Potting up tomato seedlings at Heritage Farm
Why not sow seeds in a larger container to begin with?
If you garden on a minor weighing machine and are n’t worried about run out of indoor space , get semen in larger container is perfectly okay ! However , there are jeopardy with sowing cum into potentiometer that are too large .
When starting seed indoors , it ’s of import for the size of the seedling to roughly match the sizing of its pot . This has to do with water management . As you irrigate the seedling , the pee saturate the soil . The water that soil draw farewell in two means : dehydration or transpiration by the plant life .
If a seedling is too small for its container , its lilliputian roots can only take over a little bit of the water . Most of the grease in the potty last out saturated and will not dry out out . This can lead to solution decomposition , yellowing leaves , stunted outgrowth , mould , and disease .

We use 20-row trays used to grow tomatoes on a large scale for the farm.
Potting up at Heritage Farm
On a bigger scale , pot up helps with infinite and resource management . Here at Heritage Farm , we arise thousands of seedling in our greenhouses each fountain . At this large scale , we take to plan our glasshouse space expeditiously to avoid running out of way .
For object lesson , this year , we uprise 1,300 tomato industrial plant and sowed the tomato seeds in “ 20 - row ” trays . These trays each have 20 small rows , which can each fit 20 - 30 tomato seeds . A whole 20 - words tray can therefore fit upwards of 600 tomato seedlings .
A tray of the same size of it can only fit 32 3 - in pots . The same 600 tomato seedlings in 3 - in pots would demand upwards of 19 trays , and a whole draw of greenhouse quad .

Growing tomatoes in larger pots takes up significant space.
Starting seed in small sens also help to palliate the challenge of low germination . If a tomato mixed bag has low sprouting and some seeds do n’t evolve , this wastes the space and resources used to set about those seeds .
When produce tomato plant in 20 - row trays , an instance of lowly sprouting might only emaciate a few square inches of greenhouse space . If we had planted tomato seed in separate 3 - inch pots , a few substantial inches would turn into half a tray of wasted space , grease , and water .
When should I pot up my seedlings?
Look for these signals to cognise when to pot up your plant :
True leaves : An easygoing way to tell whether a seedling is ready for potting up is to look for true leaves . When a seedling germinates , it produces its first set of foliage , called cotyledons , from the fabric within the seed . These leave-taking often bet quite unlike from the leave that the works continues to originate .
The 2d set of leaves that the works produces is the first of its “ straight ” leaf . The plant will grow truthful leaves for the relief of its life . Once a seedling has at least one or two sets of true leaves , it can handle the focus of pot up .

This case of low germination only wasted a few square inches of greenhouse space.
emerge roots : expect beneath the toilet . When a plant life outgrow its kitty , often ( but not always ) the works ’s ascendent will begin to grow out of the crapper ’s drain holes . If you see any solution growth outside the pot , the plant call for a larger blank space to grow .
have got shape : cautiously remove the seedling from its pot . The seedling ’s roots should hold the shape of the medium well . This indicates strong etymon growth and that the plant can handle the potting - up process .
Watch this video to learn when to pot up tomato seedlings:
How to pot up seedlings
Step 1 : Water your seedling in the cockcrow of the day you plan to pot up , saturating the seedling ’ roots . Saturated root serve mitigate the shock of transplanting .
verify the aerial part of the plant ( such as the stem and leaves ) are dry to help prevent damage when handling .
Tip!Just liketransplanting seedlings out of doors , judge to pot up on a Clarence Day where the conditions is overcast . This will help the beginning stay moist .

Pot up seedlings once they grow their first pair of true leaves.
whole step 2 : Gather your raw containers and some potting intermixture . check that your container of choice have drainage holes .
Your grunge mixture should be plenteous in compost or other organic matter to give the seedling an extra boost of nutrient . The dirt mix should also be damp , but not too wet , and should not drip when squeezed .
Step 3 : satisfy the newfangled pot with filth and create divots in the marrow , keeping in idea the size of it and depth of the seedling .

This tomato seedling is starting to sprout its first set of true leaves.
Step 4 : Carefully remove the seedlings from their one-time pots . If you have only one seedling per corporation , it is unnecessary to disturb the roots unless the flora is very root - bound .
If you have more than one seedling per stool , gently tease apart apart their roots and separate the plants . When teasing flora apart , some roots will break , and you may hear some pops and tears . These sounds may alert nurseryman , but as long as the seedling have their master root attached to the stem , they will be fine .
gradation 5 : cautiously localise the seedling into the divot in its new pot and cover its roots with soil . Gently throng the soil around the stand of the plant , but do n’t be afraid to utilize a niggling pressure . This helps prevent air house of cards beneath the surface , ensuring honest grime - to - root physical contact .

These roots of these tomato seedlings are holding their form, a good indicator that the plant is ready for potting up.
A note on planting depth :
Lycopersicon esculentum , like eggplant bush and pepper , benefit when imbed deeper than the soil line . Along a tomato seedling ’s stem are tiny nodes that have the potency to break into adventitious roots . Plant the tomato seedlings deep enough so that the soil hand just beneath its cotyledons .
Most solid food crop seedling with stems can handle having part of their stem buried .

Be careful not to implant the seedling too deep . forfend start out any grunge on top of the growing stage of the works , from which the plant will continue to farm novel leave of absence . At the attender growing point of the industrial plant , soil can damage the leaves and invite disease .
stride 5 : at once water the seedlings in their new containers . Working with moist or slightly dry soil is easier when pot up . However , this can wilt the plant quickly , especially on sunny days . piddle potted up seedling directly to impregnate the new soil in the great deal . This will relieve stress for the newly transplanted seedling .
Keep Learning !

Fill the new pots with soil and create a hole large enough to fit the plant.
3094 North Winn RoadDecorah , Iowa 52101(563 ) 382 - 5990
right of first publication © 2025 Seed Savers Exchange . Images on this web site are protected by copyright — wildcat utilisation is not allow .
Seed Savers Exchange is a taxation - exempt 501(c)3 nonprofit brass dedicated to the preservation of heirloom seeds .

Gently tease apart the seedlings.

Gently place each plant in its own pot.

Lightly pack the soil around the plant to ensure good root-to-soil contact.

This tomato seedling is not planted deep enough.

Plant tomato seedlings deep enough that the soil reaches just below its cotyledons.