# How to Start Hubbard Squash Seeds Indoors - Link: https://lifeandwork.blog/how-to-start-hubbard-squash-seeds-indoors/ - Published: 2026-09-14T15:31:28-05:00 - Author: Bert Swope Winter squash variety with fine-grained, sweet flesh enclosed within a thick rind. Stores well. Squash plants can suffer from transplant shock, so it’s best to start them indoors or direct seed outdoors after all risk of frost has passed. Furthermore, they require rich, nutrient-rich soil for optimal growth. A light layer of mulch will help deter weeds and retain moisture, but beware of overwatering: too much moisture fills air pockets and starves young roots of oxygen. ## Temperature Baby blue hubbard needs 90 to 120 frost free days for full maturity. Direct seeding in northern climates after all risk of frost has passed is recommended, though transplanting may be done. Starting indoor seeds 3-4 weeks before frost date with 70-85F soil temperatures ideal for optimal germination can start indoors as well. Once transplanted at 6 inches or with 4 or 5 true leaves (4-6in tall or higher), transplantation must be carefully done in order to minimize root disturbance and transplant shock. Seedlings should be planted into hills of soil approximately one inch deep and four to six inches apart in your garden. Once planted, they should grow vigorously but may require support from a trellis or similar structure due to their sprawling growth pattern. A trellis may prove particularly important when growing this variety. Squash vines may be vulnerable to powdery mildew, a fungal disease which covers plants in white. This condition can reduce yields by stunting them and leading to roting and poor quality harvests. To lower their chances of infection, make sure their squash plants receive full sun and are situated in well-drained soil, as this allows oxygen ingress while simultaneously encouraging fungal spore growth. Avoid overhead watering since this deprives oxygen from reaching their roots and encourages formation of fungal spores in soil which encourages fungal spore formation and encourages their proliferation into their roots – this way they reduce their chances of disease as much as possible! Mulch will help retain moisture and prevent weeds. Cucurbits are vulnerable to several insect pests, including cabbage loopers, squash bugs and vine borers; floating row cover may help stop eggs being laid onto young plants before the season has even started! For additional protection use non-synthetic fertilizer with lower first numbers than second numbers such as organic slow release fertilizer in order to minimize nutrient burn. ## Light Squash seeds need plenty of light for proper development. Direct seeding or starting them indoors requires much more light than outdoor planting; when temperatures warm up they may receive natural sunlight but many gardeners find a grow light more useful for producing healthy plants with rapid growth rates. Light intensity (measured in foot-candles or Fc) should be considered when growing squash as it triggers flowering and fruit production. As squash seeds absorb water, their outer hard shell swells and ruptures, releasing its embryo within to emerge – including two organs known as cotyledons: one shoot and one root that form simultaneously and serve to anchor them to the soil while taking in nutrients and water from its surroundings. A cotyledon will often form before any shoots emerge. Squash plants tend to be forgiving of poor soil quality when transplanted or grown in gardens; however, once transplanted they will not thrive under poor conditions. A well-draining soil with an ideal pH between 6.0 to 6.5 is best suited to their health and yields. If you’re saving your own squash seeds, be sure to separate the varieties to prevent cross-pollination and ensure true-to-type squash harvest. It is recommended that varieties be spaced 800 feet to 1/2 mile apart when growing for seed; otherwise hand pollinate each variety so as to prevent pollen contamination with pollen from another variety. ## Soil Hubbard squash seeds require rich, well-draining soil. Raised beds or amending your garden area with compost or sand may help provide adequate drainage. A pH range between 5.5 to 6.5 should be ideal, with tests readily available at most garden centers for testing the pH value. Once watered thoroughly but without overdoing it – as hubbard squash seedlings require moisture for proper germination and root development while overwatering can cause root rot or even kill the plant – are important considerations in cultivating successful harvests! Once squash seeds emerge, their initial leaves are oval-shaped cotyledons which must be protected until their true leaves begin to grow and the plant is ready for transplanting. Since squash plants are sensitive to frost damage, protection should be provided until warmer weather returns. Squash vine borers can be an increasingly frustrating problem for gardeners. Attracted by cucurbit family plants such as cucumbers, melons, okra, and squash, these pests feed on any part of their development that produces flowers – including cucumbers, melons, okra and squash. Row covers should be applied prior to flower production; once attacked it’s best to cut off affected stems at where borers first entered and pack moist soil over this cut – hopefully no eggs may have been laid yet and so it helps your plant recover faster. Mulching will do more than protect the plant from borers; it also helps retain moisture in the soil, suppress weeds and regulate soil temperature – as well as increase squash seed germination rates. ## Water Beginning indoor seeds or planting them directly in your garden, squash plants require ample amounts of water in order to thrive. On average, an inch should be applied weekly; if no rain falls at all then daily irrigation may be necessary; even on sunny and warm days this helps avoid squash rot or fungal disease from appearing. As seeds begin to germinate, it is vital to ensure they remain moist in order to avoid damping off, which is a fungal infection affecting seedlings. Damping off typically manifests itself when soil-level stems turn brown, thus killing off plants. Squash plants can experience transplant shock when moved from pots or containers, so try not to disturb their roots as much as possible when moving them out into your garden. Repotting must only take place when all threats of frost have passed and all danger has passed for safe movement into it. As your plants establish themselves in your garden, be wary of squash pests like aphids which may cause discoloration of leaves and necrotic spots to appear on them. Furthermore, keep an eye out for squash vine borers which feed off of vine borer larvae by burrowing into its center stem, hollowing it out and blocking water flow to other parts of the plant. ### Share this: * [ Print ](https://lifeandwork.blog/how-to-start-hubbard-squash-seeds-indoors/#print?share=print) * [More](https://lifeandwork.blog/how-to-start-hubbard-squash-seeds-indoors/#) * [[ * [Share on Tumblr](https://www.tumblr.com/share) * [ Email ](https://lifeandwork.blog/how-to-start-hubbard-squash-seeds-indoors/?subject=%5BShared%20Post%5D%20How%20to%20Start%20Hubbard%20Squash%20Seeds%20Indoors&body=https%3A%2F%2Flifeandwork.blog%2Fhow-to-start-hubbard-squash-seeds-indoors%2F&share=email) * [Tweet](https://twitter.com/share) * [ Telegram ](https://lifeandwork.blog/how-to-start-hubbard-squash-seeds-indoors/?share=telegram) * [ WhatsApp ](https://lifeandwork.blog/how-to-start-hubbard-squash-seeds-indoors/?share=jetpack-whatsapp) * [ Reddit ](https://lifeandwork.blog/how-to-start-hubbard-squash-seeds-indoors/?share=reddit) * [ Threads ](https://lifeandwork.blog/how-to-start-hubbard-squash-seeds-indoors/?share=threads) * [ Mastodon ](https://lifeandwork.blog/how-to-start-hubbard-squash-seeds-indoors/?share=mastodon) * [ Nextdoor ](https://lifeandwork.blog/how-to-start-hubbard-squash-seeds-indoors/?share=nextdoor) * [Post](https://x.com/share) * [ Bluesky ](https://lifeandwork.blog/how-to-start-hubbard-squash-seeds-indoors/?share=bluesky) ### _Related_